Short Description

Model No.: single-plate-wafer-check-valve

China Valves Manufacturer offers single plate wafer check valve.

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Key Specifications / Features

Type: Single Plate Wafer Check Valve
Design & Manufactured to API 6D, ASME B16.34 or Equivalent
P.T Ratings to ASME B16.34
Face to Face dimensions to ASME B16.10
Flanged Ends to ASME B16.5
Butt-weld Ends to ASME B16.25
Threaded Ends to ASME B1.20.1
Socket-weld Ends to ASME B16.11
Valves Marking to MSS SP-25
Inspect & Tested to API 598
Size Ranges from 1 1/2” thru 24”
Pressure Ratings from Class 600 to Class 2500, PN110 to PN420
Structures in Bolted or Pressure Sealed Union Cover
Ends Connections in Flanged R.F or RTJ, Threaded NPT, BSPT, Welded S.W, B.W and Grooved
Body Materials available in Cast Carbon Steel, Low Temp. Carbon Steel, Alloy Steel, Stainless Steel, Monel, Alu. Bronze etc.
Trim Materials available in 13%Cr, F11, F22, SS304, SS304L, SS316, SS316L and other specials.

What are Single Plate Wafer Check Valves

Single plate wafer check valves are known as butt check valves, single disc check valves or swing check valves. Single plate check valves are designed to prevent backflow in pipeline installations. They are constructed to fit directly between flanges in accordance with DIN, JIS or ANSI standards.
The single plate butt check valve has a solid body with a thin plate profile in the center that allows it to be set between a set of flanges. It is made in accordance with ASME B16.34. Flanges are intended to connect pipes, valves and various piping devices for the purpose of creating piping systems.
The single plate check valve is held in a central position by flange attachment screws. The number of screws per installation depends on the size of the valve. An O-ring seal is used to protect the valve from external influences. Single plate check valves operate at low pressures. Sizes are available from 1-1/2″ to 6″. The valve helps provide a quick access during cleaning and maintenance work.
The single plate butt check valve is suitable for industrial piping installations used to transport liquids and gaseous fluids. It blocks the fluid to one side of the pipeline within the allowable temperature and working pressure range. They are not suitable for applications in media with solid particles.
Single plate butt check valves, also known as swing type, offer the same performance as swing check valves, but at a lower cost. The normal materials for long single plate butt check valves are stainless steel (CF8/CF8M) and WCB.

What is the difference between double plate and single plate check valves?

Check valves are designed in different types to suit different system applications. Double and single plate check valves are the most common check valves used in system design. Both types of valves serve the same purpose, which is to prevent backflow in the system.

Check valve design
Dual plate
Single plate
Disk body
Two disk
One disk
Body thickness
Unit weight
Unit cost

Why do I need a single plate check valve?

The benefits of using a single plate check valve are as follows.

  • It can operate effectively in both horizontal and vertical pipelines.
  • Soft seat valves have two O-ring materials, fluororubber and NBR seat.
  • Long service life and trouble free operation.
  • Easier handling and installation.
  • Light series check valves.
  • Advantages of using double plate check valve
  • Light weight, so it is easier to operate.
  • It can be installed horizontally or vertically.
  • The design is more compact and the structure is more reasonable.
  • Pressure reduction, regardless of the valve pressure level, can reduce energy loss.
  • There is essentially no slip.
  • Streamlined runner.
  • Long life, trouble free valve operation.
  • Efficient and positive sealing under pressurized conditions. When the flow rate is zero, the valve closes before the flow rate reverses.

Can you install the check valve horizontally?

In order to create the best flow effect of the check valve, it is important to adhere to the best installation method. A simple error can lead to reduced efficiency, failure to achieve optimal performance, or significant damage to other equipment in the system. Some key points of installation instructions should be kept in mind as follows.
Check the valve surface and O-ring material to ensure there is no contamination before installation.
Ensure that the installed check valve meets the operating requirements, such as pressure category, chemical resistance, pipe size and connection.
Install a straight line at least 5 times the nominal diameter before and after the swing check valve.
The outlet support allows the check valve to have a larger opening angle and higher throughput.
Do not install the valve directly on the flange of the pump.
Avoid pulsation and pressure effects.
If the valve can be opened at the top of the system, vertical throughput is allowed.
The ring screw must be at the top to achieve horizontal throughput.
Swing check valves are placed between two flanges with ring screws. According to the outer diameter of the shell and the inner side of the flange screw, it is installed in its central position.
Please refer to the torque value when tightening the flange screws.
After installation, check the tightness of the connection through pressure inspection.

Applicable Standards of pressure-seal swing check valve

  • Design: ASME B16.34, API6D 
  • Fire safe: API 607 
  • Anti static: API 608, API6D 
  • Face to face: ASME B16.10, API6D
  • Welding ends: ASME B16.25
  • Inspection and test: API 598, API 6D

We focus on valves in standard and special materials as customer request.
Our main materials show as the follows:
Any request for other materials, please contact our machinery sales or engineering team on email.

Special Material Titanium or Titanium alloy series Titanium (Gr.2,Gr.3,Gr.5,Gr.7,Gr.12)
Nickel alloy series Ni6,Ni200,Ni201
Monel 400,Monel k500
Inconel 600/625/690/750
Incoloy 800/825/800H/800HT
Hastelloy B3/C/C4/C22/C276/G30
Zirconium alloy series Zirconium 702/703/705
Bronze alloy series Nickel aluminum bronze C95800
(Super) Duplex Steel ASTM F51/F53/F55
Other corrosion resistance Alloy 20,AISI 321,310,904L
Normal Material Carbon Steel WCB,WCC,LCB,LCC,A105N,LF2
Alloy Material (Low Temperature) LC1,LC2,LC3,LF3
Alloy Material (High Temperature) WC1,WC6,WC9,C5,C12A
Stainless Steel CA15,CF8,CF8M,CF3,CF3M

Dimensions of Single-Plate Wafer Check Valves API Std. 594 Class 150-2500 Type A

single plate wafer check valve - Single Plate Wafer Check Valve
150 300 600 900 1500 2500
2 60 60 60 70 70 70
67 67 67 83 83 83
3 73 73 73 83 83 86
4 73 73 79 102 102 105
6 98 98 136 159 159 159
8 127 127 165 206 206 206
10 146 146 213 241 248 254
12 181 181 229 292 305 305
14 184 222 273 356 356  
16 191 232 305 384 384  
18 203 264 362 451 468  
20 219 292 368 451 533  
24 222 318 438 495 559  
30 305 368 505      
36 368 483 635      
42 432 568 701      
48 524 629        
NPS 150 300 600 900 1500 2500


  • Dimensions are in millimeters unless otherwise indicated.
  • The face-to-face tolerance shall be as specified in ASME B16.10 for sizes
    through NPS 24 and shall be 3 mm for sizes larger than NPS 24.
  • Flange faces with ring-joint grooves shall conform to the dimensions
    shown in either ASME B16.5 or ASME B16.47, as applicable.

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