Diaphragm Valve Manufacturer









Reliable Diaphragm Valve
- Selection Tip: Be aware that there is also an automated valve with a diaphragm-type actuator that has a similar name. It’s important to confirm the specific type of valve referred to by the manufacturer to avoid confusion.
- Classification: A diaphragm valve is a linear motion valve that is used to start/stop and control fluid flow.

Quality Control
PMI Test
Sealing Test
Low Emission Test
Impact Test
Dimension Inspection
Painting Thickness Test
PT
Material Inspection
Our Valve Applications in Key Industries
Chemical Processing
Petrol Chemical
O.P.G & Nuclear
Pulp
Mining
Water & Sewage
Steam System
Boiling System
Get More Versatile Valve
Method Of Control
Advantages | Disadvantages |
Extremely clean | Can only be used in moderate temperature (-60 to 450°F) |
Leak proof seal | Can only be used in moderate pressures (approximately 300psi) |
Tight shut-off | Cannot be used in multi-turn operations |
Easy maintenance | No industry standard face-to-face dimensions |
Repairs can be made without interrupting pipeline | The body must be made of corrosive resistant material |
Reduce leakage to the environment |
Diaphragm Valve Function
Types of Diaphragm Valves
Weir-Type


Straight-Through
Media
Category | Description |
Flow Control and Maintenance | Products designed to control, maintain, and regulate the flow of materials through hoses, pipes, or tubing. These materials can be liquid, gaseous, or semi-solid (such as colloids and slurries). |
Flow Measurement and Monitoring | Devices used to measure and monitor the flow, level, density, specific gravity, and viscosity of materials. |
Product Families |
|
Applications | Diaphragm valves are ideal for handling corrosive fluids, fibrous slurries, radioactive fluids, or other materials that must remain uncontaminated. The diaphragm prevents direct contact with the media, making these valves suitable for sticky or viscous fluids that might clog other valve types. |
Valve Components

Body
Stem
- Non-Indicating Stem: In this design, the stem does not rotate but moves up and down when the handwheel rotates a bushing. The diaphragm, attached to the compressor, moves accordingly. Non-indicating bodies can use sealed bonnets with a seal bushing.
- Indicating Stem: Similar to the non-indicating design, but the stem is longer and extends through the handwheel, allowing for visual indication. Indicating bodies can also use a sealed bonnet with a seal bushing and O-ring.
Bonnet
The bonnet covers the top of the valve, housing the non-wetted parts, the compressor, and the handwheel mechanism. Bonnet designs can be quick-opening and lever-operated, interchangeable with standard bonnets on weir-type bodies. Larger valves used in vacuum services might require a sealed, evacuated bonnet.
Compressor
The compressor operates the diaphragm and is located above it, under the handwheel stem. Shaped like the valve’s flow passage, the compressor is essential for controlling the diaphragm’s movement.
Actuator
Material Of Construction
Material | Size | Temperature | ||
inches | mm | F | ℃ | |
Butyl rubber | 0.6-14 | 15-350 | -22 to 134 | -30 to 90 |
Nitril rubber | 0.6-14 | 15-350 | 14 to 134 | -10 to 90 |
Neoprene | 0.6-14 | 15-350 | -4 to 134 | -20 to 90 |
Natural/synthetic rubber | 0.6-14 | 15-350 | -40 to 134 | -40 to 90 |
White natural rubber | 0.6-5 | 15-125 | -31 to 134 | -35 to 90 |
White butyl | 0.6-6 | 15-150 | -22 to 212 | -30 to 100 |
Viton | 0.6-14 | 15-350 | 41 to 284 | 5 to 140 |
Hypalon | 0.6-14 | 15-350 | 32 to 134 | 0 to 90 |
Butyl rubber | 0.6-14 | 15-350 | -4 to 248 | -20 to 120 |
- Selection Tip: If the diaphragm valve will be used in a high-pressure, high-temperature system, it’s important to consult the manufacturer to confirm a safe valve design.
Connection Type
"Non-wetted" and "Wetted"
Non-wetted and wetted are terms used to describe the body and stem design.
Flow Coefficient
- Linear: The flow rate is directly proportional to the disc’s travel. For example, if the disc is open at 50%, the flow rate is at 50% of the maximum flow.
- Equal Percentage: The flow rate changes based on the percentage of valve opening. For instance, if opening the valve from 20% to 30% increases the flow rate by 70%, then changing it from 30% to 40% would result in another 70% increase in flow rate.

Pressure Drop
Rangeability
Valve Sizing
Cv/d2 | di/Do (inches) | ||||
0.5 | 0.6 | 0.7 | 0.8 | 0.9 | |
4 | 0.99 | 0.99 | 1 | 1 | 1 |
6 | 0.98 | 0.99 | 0.99 | 1 | 1 |
8 | 0.97 | 0.098 | 0.99 | 0.99 | 1 |
10 | 0.96 | 0.97 | 0.98 | 0.99 | 1 |
12 | 0.94 | 0.95 | 0.97 | 0.98 | 1 |
14 | 0.92 | 0.94 | 0.96 | 0.98 | 0.99 |
16 | 0.9 | 0.92 | 0.95 | 0.97 | 0.99 |
18 | 0.87 | 0.9 | 0.94 | 0.97 | 0.99 |
20 | 0.85 | 0.89 | 0.92 | 0.96 | 0.99 |
25 | 0.79 | 0.84 | 0.89 | 0.94 | 0.98 |
30 | 0.73 | 0.79 | 0.85 | 0.91 | 0.97 |
35 | 0.68 | 0.74 | 0.81 | 0.89 | 0.96 |
40 | 0.63 | 0.69 | 0.77 | 0.86 | 0.95 |
Features and Benefits

- Position Indicators: Piston indicators are located on top of the valve to show the direction of flow, making it easier to monitor and control the system.
- Adjustable travel stop
- Protective stem cap
- O-ring sealed stem
- Bronze bushing
- Position indicator
- Molded closed diaphragms
- PVDF corrosion-resistant coating
Applications
Slurry Applications
High-Purity Applications
Corrosive Applications
Vacuum Applications
Standards
Bubble-Tight Shut-Off
Broad Material Availability
Bonnet Isolation
Secondary Containment


Availability
- Weir Body
- Straight Body
- DIN3202
- BS5156
- MSS SP-88
- Flanged Ends
- Welded Ends
- Threaded Ends
- Other Options Upon Request
Test Durations and Test Pressures Based on Diaphragm Maximum Service Pressure Ratings
SIZE (in.) | Maximum Pressure Rating psi (bar) | Shell Test Pressure psi(bar) | Minimum Durationof Shell Test Minutes(1) | Seat Test Pressure psi (bar) | Minimum Duration of Seal Test Minutes(1) |
1/2-1 | 200(13.8) | 240(16.5) | 1/4 | 200(13.8) | 1/4 |
1-1/2-2 | 175(12.1) | 210(14.5) | 1/4 | 175(12.1) | 1/4 |
2-1/2-4 | 150(10.3) | 180(12.4) | 1 | 150(10.3) | 1/2 |
5-6 | 125(8.6) | 150(10.3) | 1 | 125(8.6) | 1/2 |
8 | 100 (6.9) | 120 (8.3) | 1 | 100(6.9) | 1/2 |
10-12 | 65(4.5) | 80 (5.5) | 3 | 65(4.5) | 1/2 |
(1)Theminimum duration is the period of inspection after the valve is fully prepared and under full test pressure. |
Body Materials Available
WEIR BODIES | ||||
Body Type | Material | Identification* | Maximum Temperature** | |
F | ℃ | |||
Metal | Iron | Cl or GXXX | 350 | 107 |
Ductile Iron | DI or DXXX | 350 | 177 | |
Carbon Steel | WCBor LCB | 350 | 177 | |
Bronze | B61 or B62 | 350 | 177 | |
Stainless | CF8M | 350 | 177 | |
Steel 316 | ||||
CN7M | CN7M | 350 | 177 | |
Monel | M35 | 350 | 177 | |
Hastelloy | CWXM | 350 | 177 | |
Plastic Lined | PP | Blue | 200 | 93 |
PVC | Grey | 140 | 60 | |
Saran | Black | 175 | 80 | |
PVDF | White with tab | 285 | 140 | |
PTFE | White | 300 | 149 | |
Rubber Lined | Soft Natural | #5 | 180 | 82 |
Neoprene | #7 | 200 | 93 | |
HypalonCSM | #9 | 200 | 93 | |
Hard Natural | #10 | 200 | 93 | |
Soft Gum | #11 | 140 | 60 | |
Rubber | ||||
Graphite | #12 | 200 | 93 | |
Loaded | ||||
Natural | ||||
Butyl | #16 | 200 | 93 | |
Glass Lined | Borosilicate | Blue glass | 350 | 177 |
Glass |
STRAIGHTWAY BODIES | ||||
Body Type | Material | Identification* | Maximum Temperature** | |
F | ℃ | |||
Metal | Iron | Clor GXXX | 225 | 107 |
Carbon Steel | WCB | 225 | 107 | |
Stainless | CF8M | 225 | 107 | |
Steel 316 | ||||
Plastic lined | PP | Blue | 200 | 93 |
Tefzel ETFE | White | 225 | 107 | |
Rubber lined | Soft Natural | #5 | 180 | 82 |
Neoprene | #7 | 200 | 93 | |
HypalonCSM | #9 | 200 | 03 | |
Hard Natural | #10 | 200 | 93 | |
Butyl | #16 | 200 | 93 | |
Glass lined | Borosilicate | Blue glass | 225 | 107 |
Glass | ||||
*Xdesignates a numerical value | ||||
**Temperature may decrease dependent on media,pressure and valve size. |
Recommended Guidelines
WEIR VALVES |
Maximum Velocity ≤25 fps for media with no suspended solids |
Maximum Velocity ≤10 fps for media with 1-15% solids |
Maximum Valve P ≤25% Pinlet for throttling |
Maximum Solids ≤15% |
STRAIGHTWAY VALVES |
Maximum Velocity≤25 fps for media with no suspended solids |
Maximum Velocity≤15 fps for media 1-15% solids |
Maximum Velocity≤10 fps for media with solids>15% |
Maximum Solids≤50% |
Body Lining Materials Instruction
BODY LINING MATERIALS INSTRUCTION | |||
Material | Code | Suitable temperature | Applicable medium |
*Fluorinated ethylene propylene | FEP、F46 | 150℃ | This material can withstand different densities of hydrochloric acid, sulfuric acid, hydrofluoric acid, aqua regia, nitric acid, and various types of organic acids, alkalis, and weak acids. It is resistant to alternating exposure to strong acids and other corrosive media, except for molten alkali metals, elemental fluorine, and aromatic hydrocarbons. |
Poly chlorotrifluoroethylene | PCTFE、F3 | ≤120℃ | |
Polyvinylidene fluoride | PVDF、F2 | ≤120℃ | |
Ethylene tetrafluoroethylene | TFE/E、F40 | ≤120℃ | |
Tefzel |
|
| |
Perfluoroalkoxy | PFA | ≤180℃ | |
Acid-resistant enamel |
| ≤100℃ | This material is generally resistant to corrosive media, except for hydrofluoric acid, strong phosphoric acid, and strong alkalis. |
Reinforced polypropylene | RPP | ≤100℃ ≤100℃ | This material is resistant to most organic acids, mineral acids, and inorganic solvents, except for strong nitric acid, oleum, chlorosulfonic acid, and strong oxidizing agents. |
Polyolefin | PO | ≤100℃ | The product is suitable for transporting various media, such as corrosive gases, liquids, and solid-liquid mixtures. It has excellent resistance to corrosion from acids, alkalis, and salt solutions. Additionally, it features static resistance and is non-toxic. |
Castiron unlined |
| ≤100℃ | Non-corrosive medium |
Stainless steel,unlined |
| ≤150℃ | Usual corrosive medium |
Fluorinated ethylene propylene | FEP | ≤120℃ | The material is resistant to different densities of sulfuric acid, hydrofluoric acid, aqua regia, high-temperature strong nitric acid, various organic acids, strong oxidants, alternating exposure to strong and weak acids, alternating exposure to acids and alkalis, and many types of organic solvents. |
Perfluoroalkoxy | PFA | ≤150℃ | |
|
|
| |
Teflon | PTFE | ≤180℃ | Also have the good features of corrosion resistance, heat and electric resistance, viscosity resistance, viscosity resistance and low frictional coefficient. |
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| |
Note: *Marked is NTVAL standard construction The temperatures shown in the table are for reference only, as actual temperatures may vary depending on specific working conditions. Please consult the manufacturer for further details. |
Materials Instruction
Material | Code | Suitable Temperature | Applicable Medium |
Isobutylene-Isoprene Rubber | IIR | ≤120°C | Except for concentrations of sulfuric acid above 75%, hydrochloric acid above 20%, hydrofluoric acid below 60%, phosphoric acid above 85%, corrosive alkalis, and esters. |
Natural Rubber | NR | ≤85°C | Purified water, mineral salts, and diluted mineral acids, etc. |
Ethylene-Propylene-Diene Monomer (EPDM) Vistalon | EPDM | ≤120°C | Acid and alkali resistance, similar to natural rubber. Suitable for applications involving low-pressure steam, hot water, and cold water. |
Chloroprene Rubber | CR | ≤85°C | Better acid and alkali resistance, non-polar solvent resistance, and abrasion resistance compared to natural rubber. |
Nitrile Rubber (Buna-N) | NBR | ≤85°C | Oil-resistant and abrasion-resistant, with the same level of acid resistance as natural rubber. |
Hypalon | CSPE | ≤120°C | Ozone resistance, atmospheric aging resistance, acid and alkali resistance, oxidant and chemical resistance, burning and heat resistance. Not resistant to petroleum or aromatics. |
Fluoroelastomer (Viton) | FKM | ≤150°C | Corrosion resistance similar to fluoroplastics. Highly stable in strong acids, strong oxidants, organic solvents, and alkali solvents. |
Silicone Rubber | SI | ≤200°C | Heat-resistant, excellent electrical insulation, and wear-resistant. Resists corrosion from dilute acids, alkalis, salts, and water but not from petroleum products like gasoline. |
Note: Marked as NTVAL standard construction. The temperatures shown in the above table are for reference only, as actual temperatures may vary depending on specific working conditions. Please consult the manufacturer for further details. |
Cv VALUES | |||||||||||
STRAIGHTWAY VALVE CV RATINGS (100%OPEN) | |||||||||||
ITEM | 1/2 | 1 | 1-1/2 | 2 | 2-1/2 | 3 | 4 | 6 | 8 | 10 | 12 |
Flanged Unlined | 11 | 60 | 115 | 275 | 450 | 525 | 700 | 2250 | 4250 | 5000 | 5000 |
Flanged Plastic Lined | 24 | 80 | 209 | 370 | 569 | 1400 | 2644** | ||||
Flanged Hard Rubber Lined | 55 | 130 | 260 | 365 | 460 | 700 | 1800 | 3500 | 4850 | 4850 | |
Flanged Soft Rubber Lined | 42 | 79 | 220 | 365 | 460 | 700 | 1800 | 3500 | 4850 | 4850 | |
Flanged Glass Lined | 48 | 100 | 270 | 425 | 475 | 700 | 1950 | 4400 | |||
Screwed End | 15 | 39 | 120 | 265 | |||||||
Note: Flanged Soft Rubber=soft natural rubber,Neoprene,Hypalon and Butyl linings | |||||||||||
Flanged HardRubber = hard natural rubber lining. | |||||||||||
Note: Data is based on estimates. |
Cv VALUES | |||||||||||||
STRAIGHTWAY VALVE CV RATINGS (100%OPEN) | |||||||||||||
ITEM | 1/2 | 3/4 | 1 | 1-1/4 | 1-1/2 | 2 | 2-1/2 | 3 | 4 | 6 | 8 | 10 | 12 |
Flanged Unlined | 5.5 | 22 | 22 | 56 | 56 | 70 | 160 | 190 | 310 | 600 | 1200 | 1800 | 2550 |
Flanged Plastic Lined | – | 10 | 10 | 38 | 38 | 67 | 100 | 175 | 285 | 690 | 1070 | – | – |
Flanged Hard Rubber Lined | 4.0 | 10 | 10 | 31 | 31 | 55 | 115 | 160 | 260 | 625 | 1150 | 1750 | 2350 |
Flanged Soft Rubber Lined | 2.0 | 7.0 | 7.0 | 25 | 25 | 50 | 110 | 155 | 250 | 515 | 1150 | 1750 | 2350 |
Flanged Glass Lined | 5.5 | 22 | 22 | 53 | 53 | 78 | 180 | 250 | 420 | 850 | 1700 | – | – |
Screwed End | 4.4 | 10 | 19 | 48 | 48 | 70 | 95 | 172 | – | – | – | – | – |
Butt Weld | 3.5 | 7.5 | 18.6 | 48 | 70 | 95 | 180 | 400 | 600* | 1200* | – | – | |
Note:*Data is based on estimates |

Instruction of Diaphragm Valve Face to Face Available


Materials
PARTS | ||
Item | Description | Material |
1 | Body Flanged | Cast Iron |
2 | Bonnet | Cast Iron |
3 | Compressor | Cast iron |
4 | Diaphragm | Elastomer |
5 | Bushing | Brass |
6 | Handwheel | Cast Iron |
7 | Spindle | Steel |
8 | Spindle, Extension (indicating) | Stainless Steel |
9 | Insert | Steel |
10 | Spacer | Steel |
11 | Pin, Spirol | Stainless Steel |
12 | Washer,Shim | Polyethylene |
13 | Bearing, ThrustNeedle | Steel |
14 | Bearing, Thrust Race | Steel |
15 | Screw, SetHex. Soc. | Steel |
16 | Fitting, Tube | Steel |
17 | Screw, Hex,Ho, Cp | Steel |
18 | Nut, Hex. | Steel |
19 | Pin, Spirol | Stainless Steel |
20 | Capseal | Brass |
Weir Pattern Diaphragm Valve
- Body Options: Weir pattern available with either unlined or fully lined body.
- Compressor Coating: Elastomer or PTFE-coated compressor.
- Coating: Epoxy coating applied both inside and outside for added protection.
- Shut-off and Containment: Provides bubble-tight shut-off with secondary containment.
- Design Standard: Designed according to BS5156 standards.
Specification | Standard |
Face to Face | BS5156 |
End Flange | BS4504 |
Ratings | PN10/16 |

SIZE(DN) | Nominal pressure MPa | Working pressure MPa | L | D | D1 | n-Φd | f | H1 | H2 | D0 | W.T(kg) |
Unit:mm | |||||||||||
15 | 1.6 | 1.6 | 108 | 95 | 65 | 4-14 | 2 | 90 | 99 | 66 | 2 |
20 | 117 | 105 | 75 | 4-14 | 2 | 93 | 103 | 66 | 3 | ||
25 | 127 | 115 | 85 | 4-14 | 2 | 100 | 112 | 66 | 4 | ||
32 | 146 | 140 | 100 | 4-18 | 2 | 127 | 144 | 96 | 6.5 | ||
40 | 159 | 150 | 110 | 4-18 | 2 | 136 | 156 | 96 | 7.5 | ||
50 | 190 | 165 | 125 | 4-18 | 2 | 151 | 177 | 118 | 10 | ||
65 | 1 | 1 | 216 | 185 | 145 | 4-18 | 2 | 183 | 213 | 165 | 16 |
80 | 254 | 200 | 160 | 8-18 | 2 | 198 | 273 | 230 | 23.5 | ||
100 | 305 | 220 | 180 | 8-18 | 2 | 266 | 320 | 280 | 34 | ||
125 | 356 | 250 | 210 | 8-18 | 3 | 319 | 386 | 280 | 44 | ||
150 | 406 | 285 | 240 | 8-22 | 3 | 380 | 453 | 368 | 67.5 | ||
200 | 1 | 0.6 | 521 | 340 | 295 | 8-22 | 3 | 506 | 626 | 400 | 141.5 |
250 | 635 | 395 | 350 | 12-22 | 5 | 598 | 734 | 500 | 229 | ||
300 | 1 | 0.4 | 749 | 445 | 400 | 12-22 | 5 | 698 | 778 | 560 | 321 |
350 | 787 | 5105 | 460 | 16-22 | 5 | 723 | 883 | 560 | 360 | ||
400 | 1 | 0.25 | 914 | 565 | 515 | 16-26 | 5 | 868 | 1078 | 640 | 584 |
Pneumatic Fail Closed Diaphragm Valve
- Valve Pattern: Weir Pattern, Pneumatic Fail Closed
- Body Options: Available in unlined or fully lined body
- Compressor Coating: Elastomer or PTFE-coated compressor
- Coating: Epoxy coating applied both internally and externally
- Shut-off and Containment: Bubble-tight shut-off with secondary containment
- Design Standard: Designed according to BS5156
Specification | Standard |
Face to Face | BS5156 |
End Flange | BS4504 |
Ratings | PN10/16 |

SIZE (DN) | Nominal pressure MPa | Working pressure MPa | L | D | D1 | n-Φd | f | H |
Unit:mm | ||||||||
15 | 1.6 | 1.6 | 108 | 95 | 65 | 4-13.5 | 2 | |
20 | 117 | 105 | 75 | 4-13.5 | 2 | |||
25 | 127 | 115 | 85 | 4-17.5 | 2 | 394 | ||
32 | 146 | 140 | 100 | 4-17.5 | 2 | 400 | ||
40 | 159 | 150 | 110 | 4-17.5 | 2 | 485 | ||
50 | 190 | 165 | 125 | 4-17.5 | 2 | 635 | ||
65 | 1.0 | 1.0 | 216 | 185 | 145 | 8-17.5 | 2 | 650 |
80 | 254 | 200 | 160 | 8-17.5 | 2 | 660 | ||
100 | 305 | 220 | 180 | 8-17.5 | 2 | 816 | ||
125 | 0.6 | 356 | 250 | 210 | 8-22 | 3 | 825 | |
150 | 406 | 285 | 240 | 8-22 | 3 | 1013 | ||
200 | 0.4 | 521 | 340 | 295 | 3 | 1300 |
SIZE (DN) | D0 | B | Code ES | Air pressure Mpa | Air joint in | Air consumption cm3 | W.T(kg) Unit:mm |
15 | |||||||
20 | 120 | 168 | 61 | 0.3 | 1/8 | 163.89 | 7.2 |
25 | 120 | 168 | 61 | 0.3~0.4 | 1/8 | 196.65 | 8.9 |
32 | 120 | 168 | 61 | 0.3~0.4 | 1/8 | 229.4 | 10.6 |
40 | 165 | 260 | 62 | 0.3~0.4 | 1/4 | 1425.7 | 19.5 |
50 | 165 | 318 | 63 | 0.3~0.4 | 1/4 | 2284.1 | 34.9 |
65 | 165 | 318 | 63 | 0.3~0.4 | 1/4 | 3048 | 39.9 |
80 | 165 | 318 | 63 | 0.4~0.5 | 1/4 | 3244.7 | 51.9 |
100 | 280 | 425 | 64 | 0.4~0.5 | 3/8 | 6964.5 | 93.2 |
125 | 280 | 425 | 64 | 0.4~0.5 | 3/8 | 7439.7 | 105.3 |
150 | 310 | 549 | 65 | 0.5 | 3/8 | 14912 | 184.5 |
200 | 483 | 749 | 66 | 0.6 | 1/2 | 49161 | 407.4 |
Pneumatic Fail Opened The Diaphragm Valve
- Valve Pattern: Weir Pattern, Pneumatic Fail Opened
- Body Options: Available in unlined or fully lined body
- Compressor Coating: Elastomer or PTFE-coated compressor
- Coating: Epoxy coating applied both internally and externally
- Shut-off and Containment: Bubble-tight shut-off with secondary containment
- Design Standard: Designed according to BS5156
Specification | Standard |
Face to Face | BS5156 |
End Flange | BS4504 |
Ratings | PN10/16 |

SIZE (DN) | Nominal pressure MPa | Working pressure MPa | L | D | D1 | n-Φd | f | H |
Unit: mm | ||||||||
15 | 1.6 | 1.6 | 108 | 95 | 65 | 4-13.5 | 2 | 343 |
20 | 117 | 105 | 75 | 4-13.5 | 2 | 345 | ||
25 | 127 | 115 | 85 | 4-17.5 | 2 | 363 | ||
32 | 146 | 140 | 100 | 4-17.5 | 2 | 430 | ||
40 | 159 | 150 | 110 | 4-17.5 | 2 | 575 | ||
50 | 190 | 165 | 125 | 4-17.5 | 2 | 588 | ||
65 | 1.0 | 1 | 216 | 185 | 145 | 8-17.5 | 2 | 769 |
80 | 254 | 200 | 160 | 8-17.5 | 2 | 816 | ||
100 | 305 | 220 | 180 | 8-17.5 | 2 | 820 | ||
125 | 1.0 | 0.6 | 356 | 250 | 210 | 8-22 | 3 | 920 |
150 | 406 | 285 | 240 | 8-22 | 3 | 1010 | ||
200 | 1.0 | 0.4 | 521 | 340 | 295 | 12-22 | 3 | |
250 | 635 | 395 | 350 | 5 |
SIZE (DN) | D0 | B | Code ES | Air pressure Mpa | Air joint in | Air consumption cm3 | W.T (kg) Unit:mm |
15 | |||||||
20 | 140 | 168 | 68 | 0.3 | 1/8 | 163.87 | 6.3 |
25 | 140 | 168 | 68 | 0.3~0.4 | 1/8 | 196.65 | 7.3 |
32 | 140 | 260 | 68 | 0.3~0.4 | 1/8 | 229.4 | 8.3 |
40 | 140 | 260 | 69 | 0.3~0.4 | 1/4 | 1458.7 | 14.3 |
50 | 140 | 260 | 70 | 0.3~0.4 | 1/4 | 3162.7 | 26 |
65 | 140 | 260 | 70 | 0.3~0.4 | 1/4 | 3243 | 30.8 |
80 | 165 | 425 | 71 | 0.4~0.5 | 3/8 | 6636.8 | 64.9 |
100 | 280 | 425 | 71 | 0.4~0.5 | 3/8 | 6948 | 70.3 |
125 | 280 | 425 | 71 | 0.4~0.5 | 3/8 | 7374.2 | 80.7 |
150 | 280 | 549 | 72 | 0.5 | 3/8 | 10652 | 131.2 |
200 | 280 | 549 | 72 | 0.6 | 3/8 | 16715 | 212 |
250 |
Pneumatic Reciprocal Diaphragm Valve with Manual
- Valve Pattern: Weir Pattern, Pneumatic Reciprocal Type
- Body Options: Available in unlined or fully lined body
- Compressor Coating: Elastomer or PTFE-coated compressor
- Coating: Epoxy coating applied both internally and externally
- Shut-off and Containment: Bubble-tight shut-off with secondary containment
- Design Standard: Designed according to BS5156
Specification | Standard |
Face to Face | BS5156 |
End Flange | BS4504 |
Ratings | PN10/16 |

SIZE (DN) | Nominal pressure MPa | Working pressure MPa | L | D | D1 | n-Φd | f | H |
Unit: mm | ||||||||
15 | 1.6 | 1.6 | 108 | 95 | 65 | 2 | ||
20 | 117 | 105 | 75 | 4-13.5 | 2 | 343 | ||
25 | 127 | 115 | 85 | 4-13.5 | 2 | 345 | ||
32 | 146 | 140 | 100 | 4-17.5 | 2 | 363 | ||
40 | 159 | 150 | 110 | 4-17.5 | 2 | 430 | ||
50 | 190 | 165 | 125 | 4-17.5 | 2 | 575 | ||
65 | 1 | 1 | 216 | 185 | 145 | 4-17.5 | 2 | 588 |
80 | 254 | 200 | 160 | 8-17.5 | 2 | 769 | ||
100 | 305 | 220 | 180 | 8-17.5 | 2 | 816 | ||
125 | 356 | 250 | 210 | 8-17.5 | 3 | 820 | ||
150 | 406 | 285 | 240 | 8-22 | 3 | 920 | ||
200 | 1 | 0.6 | 521 | 340 | 295 | 8-22 | 3 | 1010 |
250 | 635 | 395 | 350 | 5 |
SIZE (DN) | D0 | B | Code ES | Air pressure (Mpa) | Air joint in | Air consumption (cm3) | W.T(kg) Unit: (mm) |
15 | |||||||
20 | 140 | 168 | 54 | 0.3 | 1/8 | 163.87 | 5.6 |
25 | 140 | 168 | 54 | 0.3~0.4 | 1/8 | 196.65 | 6.8 |
32 | 140 | 260 | 55 | 0.3~0.4 | 1/8 | 229.4 | 7.7 |
40 | 140 | 260 | 55 | 0.3~0.4 | 1/4 | 1458.7 | 13.9 |
50 | 140 | 260 | 55 | 0.3~0.4 | 1/4 | 3162.7 | 24.5 |
65 | 140 | 260 | 55 | 0.3~0.4 | 1/4 | 3243 | 29 |
80 | 165 | 425 | 56 | 0.4~0.5 | 3/8 | 6636.8 | 63 |
100 | 280 | 425 | 57 | 0.4~0.5 | 3/8 | 6948 | 66 |
125 | 280 | 425 | 57 | 0.4~0.5 | 3/8 | 7374.2 | 75 |
150 | 280 | 549 | 58 | 0.5 | 3/8 | 10652 | 125 |
200 | 280 | 549 | 58 | 0.6 | 3/8 | 16715 | 206 |
250 |
Straight Through Diaphragm Valve
- Valve Pattern: Straight Through
- Body Options: Available in unlined or fully lined body
- Compressor Coating: Elastomer or PTFE-coated compressor
- Coating: Epoxy coating applied both internally and externally
- Shut-off and Containment: Bubble-tight shut-off with secondary containment
- Design Standard: Designed according to BS5156
Specification | Standard |
Face to Face | BS5156 |
End Flange | BS4504 |
Ratings | PN10/16 |

SIZE (DN) | Nominal pressure MPa | Working pressure MPa | L | D | D1 | n-Φd | f | H1 | H2 | D0 | W.T (kg) |
Unit: mm | |||||||||||
20 | 1.0 | 1.0 | 117 | 105 | 75 | 4-14 | 2 | 150 | 162 | ||
25 | 127 | 115 | 85 | 4-14 | 2 | 150 | 162 | 120 | 3.5 | ||
32 | 146 | 140 | 100 | 4-18 | 2 | 152 | 180 | 120 | 5 | ||
40 | 159 | 150 | 110 | 4-18 | 2 | 152 | 180 | 120 | 6 | ||
50 | 190 | 165 | 125 | 4-18 | 2 | 163 | 198 | 120 | 8.5 | ||
65 | 216 | 185 | 145 | 4-18 | 2 | 205 | 227 | 230 | 16 | ||
80 | 254 | 200 | 160 | 8-18 | 2 | 220 | 252 | 230 | 22 | ||
100 | 305 | 220 | 180 | 8-18 | 2 | 262 | 300 | 280 | 32 | ||
125 | 1 | 0.6 | 356 | 250 | 210 | 8-18 | 3 | 290 | 335 | 280 | 43.5 |
150 | 406 | 285 | 240 | 8-22 | 3 | 368 | 427 | 368 | 65 | ||
200 | 521 | 340 | 295 | 8-22 | 3 | 410 | 470 | 483 | 112.5 | ||
250 | 1 | 0.4 | 635 | 395 | 350 | 12-22 | 5 | 479 | 569 | 483 | 192.5 |
300 | 749 | 445 | 400 | 12-22 | 5 | 550 | 650 | 660 | 296 | ||
350 | 787 | 505 | 460 | 16-22 | 5 | 550 | 650 | 560 | |||
400 | 1 | 0.25 | 914 | 565 | 515 | 16-26 | 5 | 640 |
Vacuum Diaphragm Valve
- Valve Pattern: Straight Through
- Connection Types: Available with threaded or weld ends
- Shut-off: Bubble-tight shut-off
- Design Standard: Designed according to BS5156
Specification | Standard |
Face to Face | VATAC Standard |
Flanged End | BS4504 |
Lap Joints Ends | VATAC Standard |
Ratings | PN10 |

Model | DN | D | H | A | L | L1 |
Unit: mm | ||||||
GM-10C-H(I) | 10 | 19 | 80 | 55 | 240 | 120 |
GM-25C-H(I) | 25 | 32 | 105 | 80 | 240 | 120 |
GM-40C-H | 40 | 45 | 133 | 100 | 240 | 120 |
GM-50C-H | 50 | 57 | 157 | 100 | 240 | 120 |
GM-10D-H(I) | 10 | 19 | 77.5 | 50 | 150 | 150 |
GM-25D-H(I) | 25 | 32 | 105 | 60 | 75 | 75 |
Model | DN | D | H | A | L | L1 |
Unit: mm | ||||||
GM-10C-H(Ⅱ) | 10 | 19 | 80 | 55 | 195 | 120 |
GM-25C-H(Ⅱ) | 25 | 32 | 105 | 80 | 236 | 120 |
GM-10D-H(Ⅱ) | 10 | 19 | 77.5 | 50 | 150 | 75 |
GM-25D-H(Ⅱ) | 25 | 32 | 105 | 66 | 175 | 75 |
Model | DN | D | D1 | H | A | L |
Unit: mm | ||||||
GM-10C-KF | 10 | 30 | 12.2 | 80 | 55 | 75 |
GM-25C-KF | 25 | 40 | 26.2 | 105 | 80 | 120 |
GM-10C-KF | 40 | 50 | 41.2 | 133 | 100 | 120 |
Model | DN | D | D1 | H | A | L | n-Φc |
Unit:mm | |||||||
GM-10C | 10 | 46 | 36 | 80 | 55 | 75 | 4-Φ6 |
GM-25C | 0 | 70 | 55 | 105 | 80 | 120 | 4-Φ7 |
GM-40C | 40 | 100 | 80 | 133 | 100 | 150 | 4-Φ9 |
GM-50C | 50 | 110 | 90 | 157 | 100 | 180 | 4-Φ9 |
Sanitary Diaphragm Valve
- Valve Pattern: Straight Through
- Connection Types: Available with threaded or weld ends
- Shut-off: Bubble-tight shut-off
- Design Standard: Designed according to BS5156
Specification | Standard |
Face to Face | VATAC Standard |
Flanged End | BS4504 |
Ratings | PN10 |

SIZE(DN) |
A |
B |
E |
F |
Unit: mm |
||||
15 |
108 |
34 |
80 |
89/99 |
20 |
118 |
50.5 |
80 |
91/102 |
25 |
127 |
50.5 |
80 |
110/123 |
32 |
146 |
50.5 |
80 |
129/138 |
40 |
159 |
50.5 |
120 |
139/159 |
50 |
191 |
64 |
120 |
159/186 |
Threaded Diaphragm Valve
- Valve Pattern: Weir Pattern
- Connection Types: Female Threaded Ends
- Shut-off: Bubble-tight shut-off
- Design Standard: Designed according to BS5156
Specification | Standard |
Face to Face | VATAC Standard |
End Flanged | BS4504 |
Threaded Ends | BS EN10241 |
Ratings | PN10/16 |

SIZE (DN) | Nominal pressure | Working pressure MPa | L | SW | b | H1 | H2 | D0 | W.T (kg) Unit:mm |
8 | 1.6 | 1.6 | 50 | 20 | 60 | 66 | 45 | 0.6 | |
10 | 50 | 24 | 45 | 0.7 | |||||
15 | 65 | 38 | 8 | 84 | 92 | 50 | 0.8 | ||
20 | 85 | 40 | 12 | 93 | 103 | 50 | 1.1 | ||
25 | 110 | 48 | 18 | 106 | 120 | 66 | 1.9 | ||
32 | 120 | 58 | 18 | 137 | 156 | 96 | 3.3 | ||
40 | 140 | 69 | 18 | 142 | 163 | 96 | 4.2 | ||
50 | 165 | 82 | 20 | 167 | 192 | 96 | 5.8 | ||
65 | 1.6 | 1 | 203 | 90 | 30 | 190 | 225 | 165 | 9.5 |
Pinch Valve
- Flow Pattern: Straight Through Flow
- Cover and Ends: Bolted cover with flanged ends
- Body Lining: Fully body elastomer rubber lined
- Design Standard: Designed to ISO Standard
Specification | Standard |
Face to Face | VATAC Standard |
Threaded Ends | EN Standard |
Ratings | PN6/10/16 |

DN |
Nominal pressure Mpa |
Working pressure MPa |
L |
L1 |
L0 |
D |
n – Φd |
D0 |
H |
W.T (kg) Unit: mm |
|
25 |
0.6 |
0.6 |
160 |
124 |
31 |
115 |
85 |
4-14 |
120 |
137 |
3 |
32 |
165 |
145 |
40 |
140 |
100 |
4-18 |
140 |
174 |
4.5 |
||
40 |
190 |
157 |
50 |
150 |
110 |
4-18 |
140 |
186 |
5.5 |
||
50 |
210 |
160 |
60 |
160 |
125 |
4-18 |
16 |
205 |
7.5 |
||
u |
270 |
199 |
74 |
180 |
145 |
4-18 |
160 |
238 |
10.5 |
||
80 |
300 |
222 |
88 |
195 |
160 |
4-18 |
200 |
241 |
15.5 |
||
100 |
350 |
250 |
106 |
215 |
180 |
8-18 |
240 |
301 |
20 |
||
125 |
430 |
318 |
134 |
245 |
210 |
8-18 |
280 |
3bU |
32.5 |
||
150 |
500 |
350 |
158 |
280 |
240 |
8-23 |
320 |
348 |
48 |
||
200 |
0.6 |
0.4 |
650 |
446 |
206 |
335 |
295 |
8-23 |
560 |
430 |
85 |
250 |
800 |
516 |
256 |
395 |
350 |
12-23 |
560 |
540 |
|||
300 |
950 |
562 |
304 |
445 |
400 |
12-23 |
620 |
741 |
|||
350 |
1100 |
500 |
460 |
16-23 |
DN | H | A | B | D0 | Kw | W.T (kg) |
Unit: mm | ||||||
25 | 443 | 133 | 0.12 | 3 | ||
32 | 4.5 | |||||
40 | 5.5 | |||||
50 | 552 | 425 | 305 | 0.25 | 7.5 | |
65 | 552 | 425 | 305 | 0.37 | 10.5 | |
80 | 552 | 425 | 305 | 0.75 | 15.5 | |
100 | 552 | 425 | 305 | 0.75 | 20 | |
125 | 32.5 | |||||
150 | 1000 | 48 | ||||
200 | 1174 | 766 | 390 | 305 | 1.1 | 102 |
250 | ||||||
300 | ||||||
350 |
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Additional General Insights Here
Specs of Diaphragm Valve
Body Materials
Diaphragm Materials
Valve Size
Features of Diaphragm Valve
Leak-Proof Design
One of the standout features of Diaphragm Valves is their leak-proof design. The flexible diaphragm creates a tight seal, preventing leaks even in high-pressure systems. Using the leak-proof design of such valves in the chemical industry avoids hazardous spills. NTVAL large industrial valves guarantees safety and reliability in demanding environments, providing dependable operation in critical applications.
Precise Flow Control
Diaphragm Valves offer precise control over fluid flow, which is essential for effective fluid dynamics and maintaining operational efficiency. Their design provides a tight seal to prevent leakage, enhancing system safety and reliability. Additionally, these valves minimize turbulence and pressure drop, leading to improved overall system performance.
Low Friction Operation
Diaphragm Valves feature a low frictional coefficient, which reduces wear and tear on internal components. This not only extends the valve’s lifespan but also maintains consistent performance and reduces maintenance needs. The low friction design supports smooth operation, which is essential for accurate fluid control and reliable performance in demanding industrial applications.
Benefits of Diaphragm Valve
Enhanced Safety
Diaphragm Valves enhance safety in industrial environments by providing a reliable seal that prevents leaks and contamination. This is especially important in industries handling hazardous or toxic substances. Valve safety is crucial because a reliable seal can prevent accidents and protect workers, which is essential for maintaining a safe workplace.
Reduced Maintenance Costs
Using Diaphragm Valves can reduce maintenance costs due to their simple design and ease of maintenance. The high-quality sealing performance minimizes wear and tear, extending the lifespan of the valves. These valves lower operational costs with minimal part replacements and maintenance, and their durability with corrosive and high-temperature fluids makes them cost-effective for long-term industrial use.
Versatility in Applications
Diaphragm Valves are highly versatile, making them suitable for a wide range of applications. They can handle different types of fluids and operating conditions, from high temperatures to corrosive environments. It turns out, this versatility makes them an excellent choice for large-scale industrial operations, where different processes require different handling characteristics.
Applications of Diaphragm Valve
Petrochemical Industry
Mining and Steam & Boiling Systems
Oil, Gas & Nuclear
Pharmaceutical and Biotech Industries


4 Considerations When Buying x
01
Fluid Compatibility
02
High Pressure Resistant
03
Simple Diaphragm Replacement
04
ISO9001 Certified
Types of Diaphragm Valve
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