Rubber Seated Dual Plate Check Valve
Rubber Seated Dual Plate Check Valve - Image 2

Rubber Seated Dual Plate Check Valve

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Description

Technical Data Sheet

Product: Rubber Seated Dual Plate Wafer Check Valve
Materials: CF8M Body/Disc, Viton Seat

1. General Description

This valve is a dual plate, wafer type, spring-return check valve featuring a resilient seat design that ensures zero-leakage sealing. The body and main internal components are manufactured from CF8M (316 Stainless Steel), with a Viton (FKM / Fluoroelastomer) seat, offering excellent corrosion resistance and high-temperature performance. It is widely used in water, oil, gas, and various chemical media pipeline systems to prevent backflow.

2. Design, Manufacturing & Inspection Standards

  • Design Standard: API 594 (Dual Plate Check Valves)

  • Pressure Rating: ASME Class 150 / 300 (This sheet uses Class 150 as the example)

  • Flange Connection: Mates with ASME B16.5 flanges (Wafer installation)

  • Face-to-Face: API 594 Short Pattern

  • Inspection & Testing: API 598

  • Pressure-Temperature Ratings: ASME B16.34

3. Technical Parameters

Parameter Description
Nominal Size DN50 – DN600 (2″ – 24″)
Pressure Class Class 150 (PN20)
Body Material CF8M (316 Stainless Steel)
Disc Material CF8M
Hinge Pin Material SS316
Spring Material SS316 (Inconel X-750 optional)
Seat Material Viton (FKM / Fluoroelastomer)
Seal O-Ring Viton
Operating Temperature Range -20°C to +200°C (-4°F to +392°F) (limited by seat)
Suitable Media Water, steam, oils, organic solvents, acid/alkali solutions, etc. (Viton compatibility must be confirmed)
Installation Orientation Horizontal or vertical (flow upward)
Leakage Class Zero leakage (API 598 Seat Test)

4. Materials of Main Parts

No. Part Name Material
1 Body ASTM A351 CF8M
2 Disc ASTM A351 CF8M
3 Seat Viton (FKM)
4 Hinge Pin ASTM A276 316
5 Spring ASTM A313 316
6 O-Ring Viton
7 Thrust Washer PTFE
8 Eyebolt (≥DN150) SS316
9 Plug SS316

5. Main Dimensions and Weights (Class 150)

Nominal Size DN Size (in) Face-to-Face L (mm) Outer Diameter D (mm) Approx. Weight (kg)
50 2 60 103 2.5
80 3 64 133 4.5
100 4 64 157 6.5
150 6 76 212 12.0
200 8 89 268 20.0
250 10 114 320 32.0
300 12 114 373 45.0
350 14 127 415 65.0
400 16 140 472 85.0
500 20 159 582 140.0
600 24 181 692 220.0

Note: The above dimensions and weights are typical values. Final certified drawings shall prevail.

6. Pressure-Temperature Ratings (Body: CF8M / Seat: Viton)

The working pressure is limited by the lower value between the body material rating and the seat temperature limit. The table below shows the maximum allowable working pressure for CF8M Class 150 body, and the Viton seat remains reliable within the listed temperature range (Viton maximum 200°C).

Temperature (°C) Max. Working Pressure (bar)
-20 to 38 19.6
50 19.2
100 17.7
150 15.8
200 13.8

Test Pressures
Shell Test (1.5x): 29.4 bar (ambient temperature)
Seat Test (1.1x): 21.6 bar (ambient temperature)

7. Installation and Maintenance Notes

  • Install the valve strictly according to the flow direction arrow marked on the body to prevent reverse pressure.

  • For wafer installation, tighten flange bolts evenly to avoid body deformation that may affect sealing.

  • After prolonged shutdown, check spring flexibility and seat condition for aging before restarting.

  • Viton seats should avoid contact with ketones, esters, and certain amines. Please refer to a chemical compatibility chart for specific media.

8. Ordering Information

Please provide the following parameters when ordering:

  • Nominal size and pressure class (e.g., DN100 Class 150)

  • Body/Disc material (CF8M)

  • Seat material (Viton)

  • Media type and operating temperature

  • Flange standard (Default: ASME B16.5)

  • Special requirements (e.g., Inconel spring, extended eyebolt)

Should you require data for other pressure classes (e.g., Class 300), larger sizes, or double-flanged configurations, please feel free to request additional information.

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