Products: gate valve, stop valve, ball valve, check valve, plug valve, hard seal butterfly valve,

special valve for high temperature and high pressure power station.

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Sereve Service Single plate check valve

GZP dual -plate check valves are manufactured to the latest edition of API 594/API 6D and tested to API 598
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Product description

Introduction video of Wafer Check Valve :  

GZP Wafer Check Valves are manufactured to the latest edition of API 594/API 6D and tested to API 598.All valves from GZP VALVE are strictly 100%tested before shipment to guarantee zero leakage.

Wafer Check Valve is also called reflux valve, backpressure valve and one way valve. This type of valves is opened and closed by the force of the flow of media through the pipe. It's an automatic valve. They are widely applied in petroleum, chemical, textile, power, marine, metallurgy, etc.

Wafer Check Valve is made up by body, plate, stem, and spring etc. Use wafer, flange, lug connection. Because its structure length is shorter than the general check valve, it is most suitable for places with limited installation space. Plate has short closing stroke with can significantly reduce water hammer pressure.

The main construction features of GZP wafer check valve are following:

  1. Single plate and double plate design are available.
  2. The sealing surface can be surfacing wear resistant material or rubber lining.
  3. The plate has short closing stroke and spring loading, which can significantly reduce water hammer pressure.

Technical Data

Design Standard

API6D, BS1868, DIN3356,EN10739

Body Material

Carbon Steel, Stainless Steel, Alloy Steel, Duplex Steel.etc.

NACE MR-01-75/NACE MR-01-03 Special Requirements

Pressures range

ANSI 150 ~ANSI 2500 ,PN10~PN420

Size range

DN50(2") ~DN1200 (48")

Face to Face

ANSI B16.10,EN 558,DIN3202

Flanged RF, FF, RTJ Ends

ASME B16.5 ≤ DN600 (24") ASME B16.47 A ≥ DN650 (26")

BS 4504,DIN 2543-2545,EN1092

Butt-Weld BW Ends

ASME B16.25 ,DIN 3239,BS 2080, EN 12627

Temperature range

-29°~ 425°C

Design Feature


Lift type, Swing type,Wafer type,Pressure seal bonnet,Bolted Bonnet

Disc Type

Dual plate, single plate, plug type

Seat Sealing

Integral body seat ,seat welded and overlaid

Fire Safe Design

API 607,BS 6755

Inspection & Test

Visual Inspection


Material Inspection

PMI Test----Chemical Analysis

HB Test---Hardness Test

UT---Ultrasonic Test


MT---Magnetic Test

NDT Test Non-destructive

Dimention inspcetion

According to drawings

Valve Inspection and Test

API 598,DIN 3230,EN 12266,BS 5146


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