Complete dimensional reference for wafer-type single plate (dual plate) check valves. Covers PN10, PN16, PN25 (Class 150), and Class 300 pressure ratings from DN40 to DN600. All dimensions in millimeters.
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Quick Reference: Single plate wafer check valves follow ISO 5752 Series 19 face-to-face dimensions. For DN100: PN10/PN16 = 164mm, Class 150 = 175mm, Class 300 = 180mm. PN10 and PN16 share identical dimensions. All sizes DN40–DN600 available. Contact sales@kelorvalves.com for GA drawings.
Valve Specifications
Valve TypeSingle Plate Wafer Check Valve
Size RangeDN40 to DN600 (1.5″ to 24″)
Pressure RatingsPN10, PN16, PN25, Class 150, Class 300
Design StandardAPI 594, ISO 5752 Series 19
Body MaterialsCI, MS, SGI, WCB, CF8, CF8M
Seat OptionsNitrile, EPDM, Silicon, Viton, PTFE
Spring MaterialSS316 (Standard)
UnitsAll dimensions in millimeters (mm)
Contents
Material of Construction
Single plate wafer check valves are available in multiple body and disc material combinations to suit various service conditions from general water service to aggressive chemical and marine applications.
| Component | Standard Materials | Stainless Steel Options |
|---|---|---|
| Body | CI / MS / SGI / WCB | CF8 (SS304) / CF8M (SS316) |
| Disc | MS / WCB / CF8 / CF8M | CF8 (SS304) / CF8M (SS316) |
| Seat | Nitrile / EPDM / Silicon / Viton / PTFE | |
| Spring | SS316 (Standard for all configurations) | |
Material Selection Guide
For water and HVAC applications, CI body with EPDM seat is standard. For chemical service, specify CF8M (SS316) body with PTFE or Viton seat. For high-temperature service above 120°C, use metal-seated or PTFE-seated configurations. All springs are SS316 as standard for corrosion resistance.
Face-to-Face Dimensions Chart
The following table provides complete face-to-face dimensions (ØA) for single plate wafer check valves across all standard pressure ratings. Dimensions comply with API 594 and ISO 5752 Series 19 standards. All values in millimeters.
Table 1: Face-to-Face Dimensions (ØA) in mm| Size (DN) | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 600 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Class 150 (PN25) | 85 | 105 | 124 | 137 | 175 | 197 | 222 | 279 | 340 | 410 | 451 | 514 | 549 | 606 | 717 |
| Class 300 (PN40) | 95 | 111 | 130 | 149 | 180 | 216 | 250 | 307 | 362 | 422 | 486 | 540 | 597 | 654 | 775 |
| PN 10 | 94 | 109 | 129 | 144 | 164 | 194 | 220 | 275 | 330 | 380 | 440 | 491 | 541 | 596 | 698 |
| PN 16 | 94 | 109 | 129 | 144 | 164 | 194 | 220 | 275 | 331 | 386 | 446 | 498 | 558 | 620 | 737 |
| BS 10TD | 85 | 98 | 111 | 130 | 162 | 194 | 219 | 276 | 336 | 386 | 448 | 498 | 562 | 619 | 730 |
| BS 10TE | 85 | 98 | 111 | 130 | 162 | 194 | 216 | 273 | 336 | 384 | 448 | 498 | 562 | 619 | 730 |
| Dimension | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 600 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ØB (Bore) | 20 | 30 | 40 | 52 | 71.5 | 93 | 114 | 157 | 195 | 240 | 270 | 311 | 361 | 392 | 480 |
| C (Class 150) | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 29 | 29 | 38 | 44 | 51 | 60 | 64 | 70 |
Dimension Notes
ØA = Face-to-face dimension (overall length). ØB = Minimum bore diameter. C = Wafer thickness/center dimension. PN10 and PN16 share identical face-to-face dimensions for sizes DN40–DN200. For DN250 and above, slight variations exist. Class 150 (PN25) dimensions are generally longer than PN10/PN16 for the same size.
Cracking Pressure Data
Cracking pressure is the minimum differential pressure required to open the check valve disc. Understanding cracking pressure is critical for pump selection and system design, especially in low-flow or gravity-fed applications.
Table 3: Cracking Pressure (mbar)| Size (DN) | Forward Flow ↑ (mbar) | Reverse Flow → (mbar) |
|---|---|---|
| 40 | 17.5 | 1.05 |
| 50 | 12.4 | 0.75 |
| 65 | 8.8 | 0.53 |
| 80 | 10.4 | 0.62 |
| 100 | 9.6 | 0.58 |
| 125 | 10.5 | 0.63 |
| 150 | 10.8 | 0.65 |
| 200 | 15.3 | 0.92 |
| 250 | 16.9 | 1.02 |
| 300 | 20.7 | 1.24 |
| 350 | 17.5 | 1.05 |
| 400 | 19.1 | 1.15 |
| 450 | 19.9 | 1.19 |
| 500 | 16.6 | 1.00 |
| 600 | 23.9 | 1.43 |
Cracking Pressure Engineering Note
Forward cracking pressure increases with valve size due to larger disc area and spring force requirements. Reverse cracking pressure (backflow sealing) remains consistently low (0.5–1.5 mbar) across all sizes, ensuring excellent backflow prevention. For gravity-fed systems or low-head applications, consider the forward cracking pressure when selecting valve size.
Technical Notes & Installation
Installation Orientation
Single plate wafer check valves can be installed in horizontal or vertical pipelines. For vertical installation, ensure flow direction is upward. The flow direction arrow cast on the valve body must align with pipeline flow direction.
Flange Compatibility
Wafer design fits between ANSI B16.5, DIN PN10/PN16/PN25, BS 10TD/10TE, and IS 1538 flanges. Use full set of stud bolts and nuts. Do not use partial bolt sets as this can cause uneven loading and leakage.
Maintenance Requirements
Single plate check valves are maintenance-free under normal operating conditions. The spring-loaded design ensures rapid closure to prevent water hammer. No external lubrication or adjustment required.
Testing & Certification
All valves are hydrostatically tested per API 598 standards. Shell test at 1.5x rated pressure, seat test at 1.1x rated pressure. Material Test Certificates (MTC) provided with every shipment.
Applications & Industries
Water & Wastewater
Municipal water supply, distribution networks, pump discharge protection, ETP/STP plants. CI body with EPDM seat is standard for clean water service.
HVAC Systems
Chilled water and condenser water circuits, cooling tower lines, boiler feed systems. Prevents reverse flow and water hammer in large-diameter headers.
Chemical Processing
Acid, alkali, and solvent transfer lines. SS316 (CF8M) body with PTFE or Viton seat for aggressive chemical service. Common in GIDC estates.
Power & Energy
Cooling water circulation, condensate return, auxiliary systems. Large bore valves (DN300–DN600) for main cooling water isolation.
Why Specify KELOR Check Valves
Complete Size Range
DN40 to DN600 in stock or short lead time. All pressure ratings (PN10, PN16, PN25, Class 150, Class 300) available from a single source.
Technical Documentation
GA drawings, dimensional charts, torque data, and MTC provided with every order. Full compliance with API 594, API 598, and ISO 5752 standards.
Material Flexibility
CI, DI, WCB, SS304, SS316 bodies with Nitrile, EPDM, Viton, PTFE seats. Custom material combinations available for specialized applications.
Pan India Supply
Dispatch from Ahmedabad to all major industrial hubs. 3–7 day delivery for standard sizes. Export packaging available for international projects.
Commercial Information
MOQ10 Nos per size per type
Lead Time3–7 days (standard sizes)
Emailsales@kelorvalves.com
HSN Code84813000
Need GA Drawings or Custom Dimensions?
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Frequently Asked Questions
1. What is the face-to-face dimension for a DN100 PN16 single plate check valve?
For a DN100 (4 inch) single plate wafer check valve rated PN16, the face-to-face dimension (ØA) is 164 mm. For PN10 it is 164 mm, and for Class 150 (PN25) it is 175 mm. All dimensions conform to API 594 and ISO 5752 standards.
2. What is the cracking pressure for a DN200 wafer check valve?
For a DN200 single plate wafer check valve, the cracking pressure in the forward flow direction is 15.3 mbar, and in the reverse direction it is 0.92 mbar. Cracking pressure decreases as valve size increases due to the larger disc area.
3. What materials are available for single plate check valves?
Body materials include CI, MS, SGI, WCB, CF8 (SS304), and CF8M (SS316). Disc materials include MS, WCB, CF8, and CF8M. Seat options are Nitrile, EPDM, Silicon, Viton, and PTFE. Springs are SS316 as standard.
4. What is the difference between PN10 and PN16 face-to-face dimensions?
For most sizes, PN10 and PN16 single plate check valves share the same face-to-face dimensions as they follow the same ISO 5752 Series 19 standard. The difference lies in the pressure rating and wall thickness, not the overall length. Both are interchangeable in most pipeline installations.
Specify KELOR Check Valves
Complete dimensional compliance, full material traceability, and rapid Pan India dispatch.
- DN40 to DN600 Size Range
- PN10 / PN16 / PN25 / Class 150 / Class 300
- API 594 & ISO 5752 Compliant
- MTC & API 598 Test Reports
- 3–7 Day Dispatch from Ahmedabad