Single Door Wafer Check Valve

Size: 2″-12”(DN50-DN300)
Material: Ductile iron ASTM A536, 65-45-12
Design Standard: API594, JB/T8937
Connection:BS EN 1092-2 PN10/16/25, ASME B16.42 CLASS 150, AS 2129 TABLE E, JISB221210K, BS10 TABLE D/E
Pressure Rating: 175PSI, 200PSI, 250PSI, 300PSI, PN10, PN16
Temperature: 0-80 ℃
Surface Treatment: ANSI/AWWA C550
Medium: Water, gas etc.

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Product Description

Products Details

Overview of Single Door Wafer Check Valve?

Single open door Wafer check valve refers to the valve that automaticallyopens and closes the valve disc depending on the flow of medium itself toprevent the reverse flow of medium.This check valve belongs to an automaticvalve,whose main function is to prevent the reverse flow of medium,preventpump and drive motor from reversing,and the discharge of container medium.It may also be used in the supply line of an auxiliary system where the pressuremay rise above the pressure of the system

Product Drawing

No. Part Standard Specification Options
1 Valve Body EN-GJS-450-10
2 Disc SS304 SS316,AL-Bronze UNC 95400
3 Screw Carbon Steel SS304,SS316
4 Gasket EPDM NBR
5 Stem SS420 SS304,SS316,SS416
6 Gasket PTFE
7 Spring SS304 SS316
8 Lifting Hook Carbon Steel Zinc Plated


DN Dimensions(mm)
inch MM L D E F D1
2″ 50 44.5 64 33 60 107
2-1/2″ 65 48 79 42.9 73 127
3″ 80 51 94 52.4 83.5 142
4″ 100 57 118 76 106 162
5″ 125 63.5 147 95 128 192
6″ 150 70 178.5 118 150 218
8″ 200 73 235 163.5 200 273
10″ 250 79 281 194 238 329
12″ 300 86 335 241.5 287 384

The Difference Between Single Door and Double Door

The primary difference between single door and double door check valves lies in the number of doors or discs they have for controlling flow.
Single Door Check Valve: As the name suggests, a single door check valve has only one door or disc that swings or pivots to allow forward flow and closes to prevent reverse flow.
Double Door Check Valve: In contrast, a double door check valve has two doors or discs, one on each side of the valve body. These doors swing open independently to allow forward flow and close independently to prevent backflow. Each door typically operates with a hinge mechanism.
Single Door Check Valve: The single door design may result in slightly higher pressure drops compared to double door check valves due to the design constraints of accommodating only one door.
Double Door Check Valve: With two doors, double door check valves can offer lower pressure drops and smoother flow characteristics, especially in larger diameter pipes.

So Single door check valves are commonly used in applications where space and cost are primary considerations, such as residential plumbing, irrigation systems, and HVAC systems.

Malleable Iron SCC Short Compression Coupling NPT Thread

Application and Case

Products are used in fire protection system, water system, HVAC system, plumbing, gas system, irrigation system, etc.These products are used in many projects , such as China Taiwanese Building 101, Xiamen Building,Wuhan Expo Building and other famous landmark projects.


1. What is the minimum quantity of the order?
Answer: The purchase volume of mixed products is 4 tons

2. How long is the delivery time of the order?
Answer: The delivery time for general orders is about 30 days. If the order is urgent and we have stock, around 7 days.

3. What payment methods do you accept?
Answer: We accept payment terms such as TT, L/C, DP, Western Union, Paypal, etc.

4. Where is your departure port of shipment? Is it possible to deliver to the designated warehouse?
Answer: The port of departure of our goods is generally Tianjin Port or Qingdao Port. We can transport the goods to designated warehouses, such as Yiwu, Guangzhou, etc.

5. What certificates do your products have?
Answer: Our products have FM/UL certificates, and we cooperate with third-party quality inspection certification before the factory, such as SGS,TUV

6.What are the series of your products?
Answer: Our products are divided into heavy series, medium series and light series according to different markets and standards. In order to buy more competitive products for you, please communicate your purchasing needs with the salesperson.

7. Do product packaging cartons and labels support customization?
Answer: Packaging cartons and labels can be customized according to customer requirements.

8.Does the purchased product support customization?
Answer: The product supports customization, but there are purchase quantity requirements and mold costs. For details, please consult the salesperson.

9.What are the packaging methods of the product?
Answer: The packaging of the product includes carton packaging, pallet packaging, wooden box packaging, and woven bag packaging.