Single Plate Check Valve Dimensions Chart (PN10 to PN25)

Single Plate Check Valve Face-to-Face Dimensions Chart (PN10 to PN25) | KELOR
Technical Data Sheet · API 594 · ISO 5752 Series 19

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)

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
BodyCI / MS / SGI / WCBCF8 (SS304) / CF8M (SS316)
DiscMS / WCB / CF8 / CF8MCF8 (SS304) / CF8M (SS316)
SeatNitrile / EPDM / Silicon / Viton / PTFE
SpringSS316 (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) 85105124137175197222279340410451514549606717
Class 300 (PN40) 95111130149180216250307362422486540597654775
PN 10 94109129144164194220275330380440491541596698
PN 16 94109129144164194220275331386446498558620737
BS 10TD 8598111130162194219276336386448498562619730
BS 10TE 8598111130162194216273336384448498562619730
Table 2: Additional Dimensions (ØB and C) in mm
Dimension 40 50 65 80 100 125 150 200 250 300 350 400 450 500 600
ØB (Bore) 2030405271.593114157195240270311361392480
C (Class 150) 191919191919192929384451606470

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)
4017.51.05
5012.40.75
658.80.53
8010.40.62
1009.60.58
12510.50.63
15010.80.65
20015.30.92
25016.91.02
30020.71.24
35017.51.05
40019.11.15
45019.91.19
50016.61.00
60023.91.43

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

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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.

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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
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