Pipe installation folder
Source:Site Published:2010-11-24 15:45:32 Viewed:
Our products are widely used in metallurgy, mining, petrochemical, engineering machinery, port machinery and transportation and other fields.
Main products: the introduction into the line with a full range of ISO, DIN standards for a variety of pipe fittings, SAE high pressure flange, pipe clamps pipe accessories; meet GB, GB / T, JB / ZQ, JB / T, JB and other countries, or a series of industry-standard piping accessories; hydraulic rubber hose assemblies and hose assembly hydraulic rubber sheathed (low, medium, high pressure, high pressure); dry lubrication components and hydraulic equipment; to undertake the design and manufacture of various non- the subject of pipeline accessories, hydraulic systems and lubrication systems.
Materials include stainless steel, carbon steel and brass.
Company aims: "quality first, customer first." Company commitment: the product of "Three Guarantees." We are grateful to the new and old customers of the company's trust and support, we would like to cooperate sincerely with friends, create brilliant!
Main: hose assemblies and fittings; hydraulic fittings; pipe fittings prices; pipe joint model; hydraulic cylinder; hydraulic cylinder models; hydraulic cylinder prices; rod hydraulic cylinder; U-tube clip; small pipe clamps ; hose assembly; heavy-duty hose clamps; socket welding flange; Reducing flange; plate flange; quick couplings; hydraulic system; card sets elbow; welded links; Flared Straight
Hydraulic fittings
Classification of fittings
Hydraulic hose, high pressure ball valves, quick connectors singular intent, type tube fittings, welded fittings, high pressure hose.
Transitional fittings, bite type fittings, tee pipe fittings, non-standard pipe fittings, flare fittings, right angle pipe joints, rotary couplings, quick connectors, stainless steel pipe fittings, copper fittings.
Hydraulic fittings and the difference between ordinary fittings
Largest and most significant difference is that the hydraulic pressure is stunning large, sudden burst of hydraulic oil pipeline is a big impact.
I say, certainly can not replace a dedicated joint normal, because the hydraulic pressure are able to withstand a great, normal pressure up to 0.5 already dying, we are now compared to the hydraulic tube fittings to the gap abroad too large, the hydraulic hydraulic network of excellence to remind you a lot of friends to exchange session of China's own development of hydraulic tube fittings.
Types of fittings
Type of structure characteristics of the table and standard No.
Welded pipe joints
Use over and pipe welding. Joints between the body and take over the O-ring seal. Simple structure, easy to manufacture, sealing, and the pipe size of less precision. Requiring a high quality, assembly and disassembly inconvenience. Operating pressures up to 31.5MPa, work temperature -25 ~ 80 ℃, for the oil pipeline system as the medium of Table 6 to 14
JB966 ~ 1003-1977
Card sets pipe joints
Using card sets stuck pipe and seal deformation, advanced structure, good performance, light weight, small size, easy to use, widely used in hydraulic systems. Operating pressures up to 31.5MPa, requires high dimensional accuracy pipes, tube drawing required. Card sets of precision is also high. For oil, gas and general corrosive media pipeline system Table 15 ~ 26
GB3733.1 ~ 3765-1983
Expanding pipe joints
Flare tube end using sealed, no other seals. Simple structure, thin-walled tube for connection
For oil and gas as the medium of low pressure pipeline system, allowing the use of pressure in Table 41 Table 27 ~ 41
GB5625.1 ~ 5653-1985
Into the welded pipe joints
Will need a length of pipe into the pipe end fittings and pipe fittings up to the inner end of contact with the tube and pipe fittings welded into one, eliminating the need to take over, but the strict size requirements for the oil pipe, gas pipe system for the medium Table 43 49
JB3878-1985
Cone seal welding pipe joints
Over one end of the outer cone plus O-ring and fittings to match the inner cone, with the thread tight. Working pressures up to 16 ~ 31.5MPa, work temperature -25 ~ 80 ℃
As the medium for the oil pipeline system tables 50 to 62
JB/T6381 ~ 6385-1992
Withhold-type hose connector
Easy to install, but adds a tightening process. Damaged hoses, fittings coat can not be reused, with the steel braided hose assembly supporting components. With O-ring sealed with a welded pipe joint connection and usage. For oil, water, gas pipeline system for the medium. Medium temperature: oil: -30 ~ 80 ℃; air, -30 ~ 50 ℃; water, 80 ℃ the following JB/ZQ4427 ~ 4428-1986
Three-type hose connector
Hose assembly is not required to strip the outer layer. Slightly different on the hose diameter hose, the hose by fitting coat of pre-compression to compensate. Pre-compression hose in 31% to 50% range to ensure no leakage under pressure at work, will not pull plastic outer layer is not broken. With welded pipe fittings, quick couplers, sleeve type pipe joint connection used for oil, water, gas pipeline system for the media, working pressure, and the temperature at the hose connection limit JB/ZQ4429 ~ 4431 -1986
Quick connector (both ends of the retractable)
After the tube open, self-sealing, the liquid will not drain pipe, so for the regular removal applications. Structure is complicated, local resistance losses. For oil and gas pipeline system for the media, working pressure is lower than 31.5MPa, medium temperature -20 ~ 80 ℃ JB/ZQ4434-1986
Quick connector (both ends open)
For oil and gas pipeline system for the media, working pressure hose coupling medium temperature limit JB/ZQ4435-1986 by
Standard hydraulic fittings
First, type tube connector assembly (a) pre-installed ① type tube fittings of the most important aspects of pre-installed, directly affects the reliability of sealing. Devices generally require a dedicated pre. Small diameter fittings can be pre-installed on the vise. In practice, as a mother with a connector, the nut, the card sets can be pressed into the tube. There are card sets straight couplings, sleeve type terminal connected through the first, sleeve type tube fittings and other types. I found that even in the same factory shipment, these types of fittings on the cone-shaped hole depth is often not the same, the result has caused a leak, and this issue is often overlooked. The correct approach is to end what kind of pipe fittings to connect the corresponding connectors are preloaded with the same type of connector, so that it can maximally avoid leakage. ② pipe end should be flush. After sawing the tube should be flush grinding wheels and other tools, and remove the burr, clean and use high pressure air blowing off before use. ③ pre-installed, you should try to keep the tube and the coaxial connector body, if the skew is too large will cause the tube seal failure. ④ preloaded force the card should not be too large sets of pipes embedded in the outer wall just inside the edge of the card sets should not be significantly deformed. When carrying out piping connection, and then the tightening force of the provisions of the assembly. ф6-1 card sleeve tightening force is 64-1 15n, 16фmmr 259n, ф18mm for the 450n. If the pre-set deformed when the card will lose the seal. (B). Prohibited from adding sealant packing. It was sealed in order to achieve better results, put the card coated with sealant, sealant is the result into the hydraulic system, hydraulic components damping hole causing blockage problems. (C). Connecting pipe should be sufficient to make the deformation of the tube margin, to avoid the pipe by stretching force. (D). Connecting pipe should be avoided so that the lateral force, lateral force had caused the General Assembly Mifengbuyan. (E). Connecting pipe should be a good time to avoid multiple demolition, otherwise it will deteriorate the sealing performance. Type tube fittings installed (1) required by Chapter 9 of the need for acid pickling of the tube should be handled; (2) the necessary length of a saw or pipe cutting machines and other special equipment off the tube, and definitely not broken with the solution ( such as flame cutting) or a cutting wheel; remove the tube end burrs inside and outside the circle, metal chips and dirt; anti-rust agents to remove dirt and fittings; while also ensuring the tube roundness; (3) nuts, has set into the pipe sleeve , card sets the front edge (path side) from the mouth of the tube at least 3mm, and then insert the tube joint body taper, top to date; (4), slowly tighten the nut, turn the tube until the fixed time, then tighten the nut 2 / 3 4 / 3 laps; (5) open the check whether the card is cut into the tube sets, the location is correct. Card sets are not allowed axial movement can be a little rotation; (6) re-tighten the nut after passing inspection. Second, the pipe joints to prevent leakage in the hydraulic system, regardless of the metal fittings, or hose connector, there is prone to leakage problems. The type tube fittings, most of them subject to greater external force due to pipe or impact, the card sets loose or deformed face caused by leaking pipes, and you should check whether the loss of a round sleeve, with or without edge defects, whether the pipe end intact, and the compression sleeve nut degree, while also eliminating external piping. The flare tube fittings, most of them due to over-expanding, quality, or multiple sub-requirements of demolition, resulting in flare caused by deformation or cracks, leaks, this time can be re-flared front end truncated. If male and female cone top pressure seal, the leak had been caused by two cone damage, available research on the cone grinding grinding. Some with "о" face or outer ring seal by the occasion, there are several reasons for the leakage: "о" ring distortion caused by aging or leakage; "о" ring assembly is not in place, so that the two planes connected when the pressure is uneven or "о" cutting ring is caused by leakage; "о" ring is not compacted, less than the amount of elastic deformation caused by leakage; "о" ring only too deep groove caused by mouth leaks. In this regard, to be re-select the same diameter and cross section of coarse "о" ring can also be sealed with the Mouth of the slot for cutting or grinding surface to reduce the Mouth of the groove depth, so that "о" ring sufficient amount of elastic deformation (compression should normally be between 0.35-0.65mm). The use of oil rubber, wool felt, soft steel, cardboard, composite gasket or seal the pipe joints leak, whatever the material, should first check whether the seals broken, deformation, aging and rough through the large, etc. , and then take the appropriate measures. Third, the high-pressure hose connector installation notes (1) hose in a mobile or stationary, are not excessively bend, can not bend at the root of at least 1.5 times its diameter at the beginning of bending; (2) Hose Mobile to the extreme position, not pulled too tight, should be more relaxed; (3) try to avoid torsional hose; (4) hose as far as possible away from the thermal radiation component, the necessary insulation board fashion; (5) The plastic should be avoided control external damage, such as the use of long-term friction with the surface of such components; (6) If the weight caused by excessive deformation of hose, there should be supporting for parts. Fourth, 8.1 pre-installed pipe line profiles (1) dual head and branches: from the lubrication pump out until all the distributor inlet, pressure is relatively high. Usually cold drawn seamless steel tubes, the material is 10 or 15 steel. Severe corrosion of the pipe must not be used; (2) to the pipeline: from distributor to all lubrication points out of the inlet (bearing hole), pressure is relatively low. Usually drawn copper tube, easy to bend piping. There is also cold drawn seamless steel or stainless steel tube; (3) experienced active portion of a connection with hose connector. 8.2 piping layout requirements (1) pipeline to try to avoid radiation and high temperature such as cooling water spray temperature is too high or too low place, especially hose connector; (2) shall not affect the system piping and other equipment operation, to be safe, reliable, easy to work, observation, maintenance; (3) to smooth vertical and horizontal piping, neat appearance. To minimize the angle of bend bend or small, using a large arc, thus reducing the oil flow resistance; 4) Install the case of conflict, should be small tube for bassoon and low pressure pipes for high pressure pipe; (5) Pipeline crossing can not touch each other, should separated by a distance; (6) parallel to the pipe joints to be staggered installed, so as not to affect the installation and removal; (7) easy to disassemble and clean pipes to be properly installed union, but less, reducing the likelihood of leakage. 8.3 determine the tube length (1) be determined in accordance with Article 8.2 tube path, the length of the tube measured at the site, pay attention to the impact of the size of the pipe radius; (2) make access to different types of pipe fittings after effects taken into account; (3) pipe length should be determined paragraph by paragraph, cut, pre-installed, to facilitate on-site adjustment of the actual situation, if all of a sudden cut off, the accumulation of errors occurs when the piping to difficult; (4) cut short tube needs to make full use of short tubes in various places, if necessary, can be used straight couplings take long, but on the pipe joints should be less is not appropriate. 8.4 tube cut off (1) of a saw or pipe cutting machines and other special equipment off the tube, and definitely not broken with the solution (such as flame cutting) or a cutting wheel; (2) the incision should be even, the cross section flatness of not greater than 1 mm, and the vertical axis of the tube is not more than 1 degree; (3) with a file, remove the chip and burr scraper, etc.; (4) with clean compressed air or other means clear tube attached to floating debris and rust; 8.5 tube bending (1) bending machine with a cold, not hot bending (large diameter pipe joints can be replaced right angle bend), the bending radius to more than 4 times the diameter; (2) the ellipticity of the bend (the length of diameter change) less 10% in diameter, and can not appear crease; (3) If there are joints bend pipe end, pipe end and the connector should be connected to a straight pipe to avoid the impact of installation; 8.6 welded pipes and fittings (1) using GTAW or TIG arc welding, after back filling welding. When the pressure exceeds 21mpa should also pass in the inside of the tube 5l/min argon; (2) pipe wall thickness> 2mm, the cylindrical groove should be cut 35 °, and in the 3mm gap counterparts at the left; pipe wall thickness ≤ 2mm , do not cut groove, corresponding 2mm gap at the left; (1) when the tube axis must be coincident counterparts, the wrong side of the wall thickness of less than 15%, the skew of less than 1:200; 8.7 installation folder ( 1) The pipe clip plate angle and other general support directly or through welding in structural parts, in the concrete floor or wall surface side of the bracket with the expansion bolt; (2) hose clamps installation should pay attention to leveling, that is installed on the same side height; (3) clamp spacing: diameter ≤ φ10, about 0.5 to 1 m; diameter φ10 ~ 25 in about 1 to 1.5 m; diameter φ25 ~ 50 in about 1.5 to 2 meters, but in the right angle corner, both sides should be the use of a clamp. 8.8 Pre-Installation (1) fittings and equipment, connecting pipe and pipe fittings, paragraph by paragraph, until the completion of all pre-installed; (2) fittings installation method described in Chapter 4; (3) the same time, clamp pad plate welded to the structure or stent, may not be welded to the tube clamp tube or stent; (4) pre-installed and the inspection is passed, the print on the line with the mark, an A number, tabulated for use. Pipe to be removed after washing, by number recovery. 8.9 Notes (1) All pipes before installation requirements of Chapter 9 can press the pickling treatment, particularly with type tube fittings pipe connections should be pickled, and then pre-fastening sleeve pipe end; (2) All pipe joints should be cleaned with kerosene to be installed inside the o-rings should be removed temporarily put into the custody and put on the formal installation; (3) construction to maintain pumps, dispensers and other equipment of the oil port , fittings, pipe ends and other openings clean and not allow water, dust and other foreign matter into; (4) pipe should be laid in the free state, the pipe after welding shall not apply excessive force fixed and connected radial force ; (5) bearing the hole to check in advance, the internal circuit is smooth, the oil port threads are matched with the connectors. 9, pipeline cleaning the lubrication system to ensure clean, and supply machinery and equipment to clean the grease bearings must be pre-installed pipe removed after cleaning. Cleaning and acid washing are two kinds of kerosene. 9.1 kerosene cleaning objects and methods (1) brass, stainless steel pipe; (2) pre-installed prior to the pickling treatment, and the wall is now no rust, iron oxide skin of the pipe; (3) soiled during the pre-installed fittings; (4) will need to clean the pipes and fittings removed, the pipe with a cloth (to afford yarn) James kerosene wipe the tube, both ends of the joints soaked in kerosene and wash, and then filling the tube full of oil or lubricating coating fat, good to be installed at both ends sealed; (5) shall not visually visible after cleaning the contaminants (such as iron, fibrous impurities, welding slag, etc.), paying particular attention to the inner wall of welding welding slag must be thoroughly cleaned. 9.2 pickling objects (1) without pre-pickling of the steel prior to installation; (2) had been pickled, but now the serious corrosion of steel. Construction sequence and 9.3 deal with the purpose of pickling (1) degreasing degreasing agent used, except with the adhesion of the oil pipe; (2), washed with water and remove the dirt on the pipe; (3) to remove rust in the acid lotion rust spots on the wall, rolled iron, etc.; (4) high-pressure water washing and rinsing with water, these operations generated attachments, inside of the tube with high pressure water washing; (5), and the use of lye and the pipe on remaining acid; (6) In order to effectively carry out drying drying tube should be immersed in hot water or steam drying, the pipe should be dry; (7) rust; (8) to check on the pipe after pickling Check whether clean; (9) immediately after packaging and storage pickling or plastic with a sealed plastic tube openings to prevent foreign matter, moisture and other intrusion. 9.4 Pickling Notes (1) pickling operation prior to the welding pipes has been completed; (2) demolition, transport, careful not to bruise during pickling line, thread and sealing surface, blocking with sealing tape or plastic pipe ; (3) acid cleaned before welding the welding slag, spills and tubes and other objects on the varnish; (4) The application of plastic parts with thread, rubber bands and other acid-resistant material to protect, or in degreasing, washing After the thread coated with grease and then the rust in the acid to prevent acid erosion; (5), taking care not to make pickling line with the pipe symbol disappeared or blurred. 10, the formal installation of piping should be cleaned as soon as the formal installation of the pipeline and filling fat (1) by printing all lines connected with the mark, paragraph by paragraph; (2) The method of fastening according to Chapter 4, all the fittings, attention to into the original o-ring removed; (3) All piping shall be firmly fixed and can not loose; (4) all to the tubing can be left after filling with grease and lubricating oil outlet distributor point of connection.
Hydraulic fittings - Threaded Standard II
One. Thread classification
1. Screw thread and external thread since the beginning of the two;
2. By tooth-shaped sub-divided into: 1) triangular thread 2) trapezoidal thread 3) Thread the rectangle 4) serrated thread;
3. The number of lines divided by single thread and multi-thread;
4. By the direction of sub-L screw thread and two right hand thread, right hand is not marked, L plus LH, such as the M24 × 1.5LH;
5. By use of different points are: metric screw thread, with thread sealing pipe thread, pipe thread sealing non-threaded, 60 ° tapered pipe thread, metric taper thread, etc.
II. Metric screw thread
1. Metric screw thread with a capital M that tooth type angle 2α = 60 ° (α, said tooth-type half-width);
2. Metric screw thread pitch divided by coarse thread and fine pitch two common threads;
2.1. Coarse thread pitch marking is generally not indicated, such as the M20, said coarse thread; fine thread pitch marks must be identified, such as the M30 × 1.5 that fine thread, which thread pitch of 1.5.
2.2. Common thread between the parts for the mechanical connection and fastening, the general multi-threaded coarse thread, fine thread diameter than the same nominal strength of slightly coarse thread, self-locking performance is better.
3. Metric screw thread tags: M20-6H, M20 × 1.5LH-6g-40, in which M said metric screw thread, 20, said screw the nominal diameter of 20mm, 1.5 that pitch, LH said L, 6H, 6g said screw accuracy grade, class code, said upper thread accuracy, precision grade lowercase letter that male, 40, said rotary joint length;
3.1. Commonly used metric coarse thread pitch of ordinary table below (thread bottom diameter: φ = nominal diameter of carbon-P; iron φ = nominal diameter of -1.05 ~ 1.1P; processing external thread diameter rod to take φ = nominal diameter -0.13 P):
Table 1 ordinary common metric coarse thread of diameter / pitch
Nominal diameter of the pitch P of cast iron steel bottom bottom diameter of external thread rod pitch P nominal diameter cast iron bottom carbon steel threaded rod outside diameter of bottom
M5 0.8 4.1 4.2 4.9 M24 3 20.8 21 23.7
M6 1 4.9 5 5.9 M27 3 23.8 24 26.7
M8 1.25 6.6 6.7 7.9 M30 3.5 26.3 26.5 29.6
M10 1.5 8.3 8.5 9.8 M33 3.5 29.3 29.5 32.6
M12 1.75 10.3 10.4 11.8 M36 4 31.7 32 35.5
M14 2 11.7 12 13.7 M42 4.5 37.2 37.5 41.5
M16 2 13.8 14 15.7 M48 5 42.5 43 47.5
M18 2.5 15.3 15.5 17.7 M56 5.5 50 50.5 55.5
M20 2.5 17.3 17.5 19.7 M64 6 57.5 58 63.5
3.2. Metric processing common thread bottom diameter of the following formula for approximate calculation can be used: d = D-1.0825P, where D is the nominal diameter, P is pitch.
III. Sealed with a threaded pipe thread (GB 7306 and ISO7 / 1 the same)
1. With thread sealing pipe thread without packing or seal quality will be able to prevent leakage. Sealed with screw thread pipe thread and tapered cylindrical external thread, taper thread and taper external thread connecting the two forms. Pressure below 5 × 105Pa, with a connection is close enough before and after a connection is usually used under high temperature and high pressure.
2. Sealed with screw thread with tapered pipe threads, cylindrical forms. Only a form of male cone. Tooth type is as follows: taper 1:16, teeth-shaped angle 55 °, the standard example of the old thread: ZG3 / 8;
3. Markup example:
Taper thread Rc 3 / 8
Parallel internal thread Rp3 / 8
Taper external thread R3 / 8
When the thread is left hand thread when the Rc 3/8-LH (LH said left hand thread)
Common Thread (tags: Rc 3 / 8, Rp3 / 8, R3 / 8) of the basic dimensions:
Table 2
Size code number of teeth per inch diameter of large diameter in the base path from the effective length of the proposed bottom hole
1 / 8 28 9.728 9.147 8.566 φ8.4 4.0 6.5
1 / 4 19 13.157 12.301 11.445 φ11.2 6.0 9.7
3 / 8 19 16.662 15.806 14.950 φ14.7 6.4 10.1
1 / 2 14 20.955 19.793 18.631 φ18.3 8.2 13.2
3 / 4 14 26.411 25.279 24.117 φ23.6 9.5 14.5
1 11 33.249 31.770 30.291 φ29.7 10.4 16.8
1-1/4 11 41.910 40.431 38.952 φ38.3 12.7 19.1
1-1/2 11 47.803 46.324 44.845 φ44.1 12.7 19.1
4. GB 7306 labeling method provided with ISO7 / 1 requirements are the same. In the ISO 7 / 1 before making a unified, national mark as follows:
Table 3
Standard Number type taper thread screw thread taper external thread cylinder
ISO ISO7/1-1982 Rc1 / 2 Rp1 / 2 R1 / 2
British BS 21-1973 Rc1 / 2 "Rp1 / 2" R1 / 2 "
France NF E03-004 - G1 / 2 "J G1 / 2"
German DIN 2999 - Rp1/2-DIN299 R1/2DIN2999
Japan JIS 130203 PT1 / 2 "PS1 / 2" PT1 / 2 "
Soviet ГOCT 6211 KTPYБ1 / 2 "- KTPYБ1 / 2"
GB GB 133-74 ZG1 / 2 "- ZG1 / 2"
IV. 60 ° conical pipe thread (GB / T 12716-91)
1. This thread is equivalent to the American National Standards ANSI B1.20.1 NPT threaded parts. Only taper thread and taper external thread of a connection form.
2. 60 ° conical taper pipe thread and pipe thread 55 ° in the same point:
2.1. Thread sealing itself.
2.2. Cone angle: 1:16
2.3. By controlling the base surface distance (base length) to control the diameter size.
2.4. To allow the thread to add closures vice.
3. 60 ° conical pipe thread taper pipe threads with 55 ° differences: Table 4
Project 60 ° 55 ° cone tapered pipe thread pipe thread
Tag NPT 3 / 8 Rc 3 / 8, Rp3 / 8, R3 / 8
Tooth-type angle 60 ° 55 °
Teeth from different table 5 Table 2
High-low tolerances
Use of automobiles, aircraft, machine tools, pipe water, gas and other low-pressure pipeline system
4. Code NPT standard code of the old Z:
Tag: NPT 3 / 8, NPT 3/8-LH, which said L-LH.
Table 5 basic dimensions of common threads
Size code number of teeth per inch diameter of large diameter in the base path from the bottom teeth proposed
1 / 8 27 10.242 9.489 8.736 φ8.6 4.102 4.36
1 / 4 18 13.616 12.487 11.358 φ11.1 5.786 4.10
3 / 8 18 17.055 15.926 14.797 φ14.5 6.096 4.32
1 / 2 14 21.223 19.772 18.321 φ17.9 8.128 4.48
3 / 4 14 26.568 25.117 23.666 φ23.2 8.611 4.75
1 11.5 33.228 31.461 29.694 φ29.2 10.160 4.60
1-1/4 11.5 41.985 40.218 38.451 φ37.9 10.668 4.83
1-1/2 11.5 48.054 46.287 44.520 φ43.9 10.668 4.83
Five. Non-threaded sealing pipe thread (GB 7307)
1. The thread standard and ISO 228 / 1 the same.
2. Tooth type angle: 55 °, taper: 1:16.
3. Markup example:
11 / 2 L thread G11/2-LH (D-not standard)
11/2A class male G11/2A
11/2B class male G11/2B
Internal and external thread assembly G11 / 2 / G11/2A
Basic dimensions used in Table 6
Size code number of teeth per inch diameter of large diameter in the base path from the effective length of the proposed bottom hole
1 / 8 28 9.728 9.147 8.566 φ8.8 4.0 6.5
1 / 4 19 13.157 12.301 11.445 φ11.7 6.0 9.7
3 / 8 19 16.662 15.806 14.950 φ15.2 6.4 10.1
1 / 2 14 20.955 19.793 18.631 φ18.9 8.2 13.2
3 / 4 14 26.411 25.279 24.117 φ24.4 9.5 14.5
1 11 33.249 31.770 30.291 φ30.6 10.4 16.8
1-1/4 11 41.910 40.431 38.952 φ39.2 12.7 19.1
1-1/2 11 47.803 46.324 44.845 φ45.1 12.7 19.1
4. Uses: Non-threaded sealing pipe thread is not mainly used for low pressure, gas pipelines, connection to sealed with packing or quality (flax, red lead, Teflon tape, etc.) to prevent leakage.
5. Non-thread pipe thread and sealed with a threaded pipe thread sealing the same point: both the same tooth type are 55 °, the same size thread pitch, tooth high, basically the same diameter.
6. Non-threaded pipe thread sealing and sealed with a threaded pipe thread is the difference:
6.1. Sealed with screw thread pipe thread and tapered cylindrical screw thread in two forms, the thread is only a form of conical thread.
6.2. Non-threaded pipe thread seal both inside and outside the screw thread, there is only a form of cylinder.
6.3. Two different threaded part of the specification tolerances.
6.4. Non-threaded cylindrical inner seal pipe threads can be sealed with a screw thread connected to outer conical tube, but not the outer cylindrical pipe thread sealing threads can not seal the inner tube with a screw thread to form sealed with screw connection.
7. Markers of different countries: Table 7
Standard Number type cylindrical threaded cylindrical male thread
ISO ISO228/1-1982 G1 / 2 G1/2A B
British BS 2779-1973 G1 / 2 "G1 / 2" AB
France NF E03-005 G1 / 2 "H G1 / 2" AB
German DIN 259 R1 / 2 K1 / 2
Japan JIS 130202 PF1 / 2 "A B PF1 / 2" A B
Soviet ГOCT 6357 TPYБ1 / 2 "Kл2 Kл3 TPYБ1 / 2" Kл2 Kл3
GB GB 133-74 G1 / 2 "G1 / 2"
VI. Metric taper thread (GB1415)
1. Tag: ZM10, ZM10-S, ZM10/ZM10, ZM10/ZM10-S.
2. ZM-metric taper thread the tag number; standard reference distance, omit the reference from the code; S-short baseline distance.
3. Application: Suitable for gas or liquid pipeline system relies on the connecting thread screw seal (water, gas pipes, except thread), if necessary, to allow increases in the thread with the seal between the filler surface to improve its seal.
4. Public diameter diameter / pitch
Diameter 6,8,10 12,14,16,18,20,22,24 27,30,33,36,39,42,45,48,52,56,60
Pitch 1 1.5 2
Chapter American standard pipe thread
One. Standard: ANSI B1.20.1 American Standard pipe thread.
American standard pipe thread, not only for low pressure water, gas pipelines, and also for high temperature, high pressure systems.
To pipe thread, the current worldwide ISO standards formed a party to the other two major American Standard pipe thread standards.
II. Thread type
1. Basic profile: tooth type angle 60 °. Taper 1:16. Tooth type is flat flat.
2. Basic types
NPT American standard taper general purpose pipe thread
NPSC straight fittings with American standard pipe thread
NPTR guide rod connected with the American standard taper pipe thread
NPSM free on the device with the mechanical connection with the American Standard straight pipe thread
NPSL nut loose mechanical connection with the American Standard straight pipe thread with another thin-walled tube used UNS - thin tubes of special unified thread
III. General purpose NPT NPT
1. Tag: 3/8-18NPT.
2. The basic reference in diameter and the distance: the basic NPT pipe diameter is based on diameter, pitch and hand rotation combined length determined by hand between the internal and external threads together the nominal length of rotation as the base distance, the base thread surface for the big end of the section of thread (the thread diameter on cross section as the basic diameter), the thread from the small end of the base surface in the distance as the base distance.
3. Common thread size
Size code number of teeth per inch diameter of large diameter in the base path from the bottom teeth proposed
1 / 8 27 10.242 9.489 8.736 φ8.6 4.102 4.36
1 / 4 18 13.616 12.487 11.358 φ11.1 5.786 4.10
3 / 8 18 17.055 15.926 14.797 φ14.5 6.096 4.32
1 / 2 14 21.223 19.772 18.321 φ17.9 8.128 4.48
3 / 4 14 26.568 25.117 23.666 φ23.2 8.611 4.75
1 11.5 33.228 31.461 29.694 φ29.2 10.160 4.60
1-1/4 11.5 41.985 40.218 38.451 φ37.9 10.668 4.83
1-1/2 11.5 48.054 46.287 44.520 φ43.9 10.668 4.83
IV. Tube fittings straight thread NPSF
1. The standard taper pipe thread and screw assembly, to form a pressure tight joints, but only in the case of low pressure was used.
2. Markup example:
1/8-27NPSF
3. Common thread size
Five. Guide rod connected with the NPT NPTR
1. NPTR thread tooth type and standard taper pipe thread is the same. Guide rod connected require internal and external taper thread to form a rigid mechanical threaded connections.
2. Markup example:
1/2-14NPTR
3. Common thread size
VI. Mechanical connection with straight pipe thread NPSM, NPSL
1. Devices free of mechanical connection with, the internal and external threads are used NPSM thread; with the pine nuts with the mechanical connection, internal and external threads are used NPSL thread.
2. Markup example:
1/8-27NPSM
1/8-27NPSL
3. Common thread size
VII. Thin-walled tubes UNS special unified thread
1. For general purpose tube, recommended series of 27 teeth, 1 / 4 to 1 inch special unified thread UNS, thread-level rating of 2A and 2B. UNS thread form a unified screw threads.
2. Markup example:
1/4-27UNS-2A
3. Common thread size
4. Complete the minimum length of thread = 1 / 3 of the basic major diameter +0.185 inch (5 teeth).
Dry sealed Chapter American Standard Pipe Thread
One. Standard: ANSI B1.20.3 dry sealed American Standard Pipe Thread
1. Dry seal pipe thread is mainly used for coolers, marine, automotive and aircraft fuel and oil pipe joints, oil drain plug, military poison gas bombs.
2. Dry seal pipe threads to control the characteristics of the top teeth and bottom teeth to level the amount of teeth in order to ensure the end of the top teeth touch outside the metal and metal contacts first occur or occur simultaneously with the side. Top and bottom teeth tooth thread engagement to prevent leakage, and ensure not to use lubricants and seal in the case of packing form a seal tight connection.
3. Dry enclosed within the pipe threads can be cylindrical, it can be conical. The dry sealed conical outer tube is only a thread. Dry seal pipe threads of all are the right thread.
II. Dry sealed thread (NPTF) and standard pipe thread (NPT) is the same point: both the same type. The difference is:
1. Screw threads are not as high-h. NPTF inside, there is no gap between the external thread, while the NPT internal and external threads may be interference between there may be gaps.
2. NPT internal and external threads are conical, and conical NPTF external thread, internal thread with conical and cylindrical two.
3. NPT has both D-and L-threaded, but only one right hand thread NPTF.
4. ISO standard does not dry sealed with the United States corresponds to the standard pipe thread. Our metric taper thread (GB/T1415-92) and the United States the concept of dry seal pipe threads are similar.
III. Dry seal pipe threads of the four types:
1. Dry Sealed American Standard pipe thread NPTF
2. Dry enclosed SAE short taper pipe thread PTF-SAE SHORT
3. Dry sealed with American Standard straight pipe thread fuel NPSF
4. Dry sealed ordinary American Standard straight pipe thread NPSI
5. All types of standard dry seal with the relationship between the recommended thread
Dry seal male stem seal with matching thread
NPTF (tapered) male NPTF (tapered) thread
PTF-SAE SHORT (cone) internal thread
NPSF (straight) female
NPSI (straight) female
PTF-SAE SHORT (cone) Male NPSI (straight) female
NPTF (tapered) thread
IV. A dry sealed taper pipe thread NPTF
1. The integrity of screw thread series for the length of the male and female. In fact it applies to all types of pipe connections. This thread has high strength and good and sealing, in a thin section of rigid material can be reduced by internal taper thread breakage.
2. Markup example:
1 / 4 NPTF
3. This series of threads with two six-stride thread plug gauge and a smooth thread plug gauge to detect the basic dimensions, the effective depth and tooth crown heights, allowing tolerance: ± 1 buckle.
Five. 2 SAE short taper dry sealed tube thread PTF-SEA SHORT EXTERNAL
1. This series of external threads in addition to material savings due to increased clearance and in the small end of a thread at the cut away to shorten the length so that the full thread, the rest all respects consistent with the NPTF thread.
2. Markup example:
1 / 4 PTF-SAE
VI. 2 dry sealed SAE short taper pipe thread PTF-SEA SHORT INTERNAL
1. Thread of this series at the cut away except in the big end of a screw thread so that the full length of the shorter, the rest all respects consistent with the NPTF thread.
2. Markup example:
1 / 4 PTF-SAE
VII. 3 with a dry sealed fuel NPSF internal thread straight
1. This series of threads are not tapered cylindrical screw thread. They are generally used for soft or ductile materials, but thick-walled parts can also be used for brittle materials.
2. Markup example:
1 / 4 NPSF
VIII. 4 dry sealed with a straight pipe thread fuel NPSI
1. This series of threads are not tapered cylindrical screw thread.
Hydraulic Seals Co., Ltd. Tianjin Jin Haode
Manager's Office :022 -60885591
Mobile: 13752568076
Fax: 022-60885573
Website: www.hezecom.cn
Address: Huanghe Road, Nankai District, Tianjin Hongqi Road junction and the banks of Xinyuan 3-1-802 Rainbow Room.