904L Swing Check Valve,PN25,DN80,Flange End
Full open design
Bolted cover.
Swing type disc design
Optional buffering damp structure
Renewable or and welded seat
Flanged or buttwelding ends
Swing Check Valves Are Widely Used In The Industries Of Oil, Chemical, Medicine-Made, Fertilizer, City Construction, Etc. The Swing Type Check Valve Is Designed As Full Bore Full Open Structure In Order To Clean The Pipeline
Design Standard: API623/ASME B16.34
Pressure-temperature Ratings: ASME B16.34
Size Range: 2” to 28”
Pressure Range: Class 150 to 2500
End Connections: Flanged RF, RTJ, Butt Weld
Flanged End Dimensions: ASME B16.5 (≤24”), ASME B16.47 Series A or B (>24”)
Butt Weld End Dimensions: ASME B16.25 Face to Face
Face to Face Dimensions: ASME B16.10
Inspection and Testing: API 598
Material:ASTM A351 CF8, ASTM A351 CF8M, ASTM A351 CF3M, ASTM A351 CF8C
CN3MN, CK3MCUN, CN7M, ASTM A890 4A(CD3MN), ASTM A890 5A(CE3MN),
ASTM A890 6A(CD3MWCuN)
ASTM B148 C95800, ASTM B148 C95500.
The 904L stainless steel check valve adopts an internal rocker arm swing structure, with the valve disc rotating around the shaft. The valve disc opens under fluid pressure, and the fluid flows from the inlet side to the outlet side. When the pressure on the inlet side is lower than that on the outlet side, the valve disc automatically closes under factors such as fluid pressure difference and its own gravity to prevent fluid backflow. It can effectively reduce the water hammer pressure, has good sealing performance, and has no noise when closing. The contour design in line with Hydraulics is adopted to obtain a better streamlined water path with fluid guide inside, which can ensure a small pressure loss. Installed at the outlet of the water pump, it can be quickly closed before the water flows back to avoid water hammer, water hammer sound, and floor breaking impact, in order to prevent backflow and protect the equipment.
Standard brand of 904L stainless steel check valve: Chinese brand: 00Cr20Ni25Mo4.5Cu, American brand: ASTM A240 N08904
904L stainless steel chemical composition: 904 Chemical composition table: C<0.03, Si1.00, MnS2.00, PK0.035, S ≤ 0.03, Ni23.0-25.0, Cr18.0-20.0, Mo: 3.0-4.0, Cu: 4.0-5.0.
904L stainless steel check valve is a highly alloyed austenitic stainless steel with low carbon content. 904L stainless steel is designed for harsh corrosive environments* The initial 904L alloy was developed for corrosion resistance in dilute sulfuric acid. After years of practical application, it has been proven to be very successful. Now 9O4L has been standardized in many “, and has been approved for use in manufacturing pressure vessels. Like other commonly used CrNi austenitic steels, 904L alloy has good resistance to spot corrosion and Crevice corrosion, high resistance to stress corrosion cracking, good resistance to intergranular corrosion, good workability and weldability.
