Flange check valve is a valve that automatically opens and closes the valve disc by relying on the flow of the medium itself to prevent the backflow of the medium. It is also called a check valve, a one-way valve, a reverse flow valve, and a back pressure valve.
The function of the flange check valve is to only allow the medium to flow in one direction and prevent the flow in that direction. Usually this kind of valve works automatically. Under the pressure of fluid flowing in one direction, the valve disc opens; when the fluid flows in the opposite direction, the fluid pressure and the self-weight of the valve disc act on the valve seat, thus cutting off the flow.
- Specification
Normal Size Range: 1/2 2"
Normal Pressure Rating: PN10-PN250,CLASS150~1500
Material: A105.LF2,F11,F22,F304,F304LF316,F316L
Temperature Range:-29°C-425°C
- Standards compliance
Design and Manufacture: API602
Face to face(end to end): ASME B16.10
Flanged connection. ASME B16.5
Butt welded end: ASME B16.25
Socket-Welding Ends: ASME B16.11
Screwed Ends: ASME B1.20.1
Test and inspection: API 598
Main Part & Materials
| Part Names | Part Materials | ||||||
| Body | WCB/A105 | LCB/LF2 | WC6/F22 | CF8/F304 | CF8M/F316 | CF3/F304L | CF3M/F316L |
| Bonnet | WCB/A105 | LCB/LF2 | WC6/F22 | CF8/F304 | CF8M/F316 | CF3/F304L | CF3M/F316L |
| Ball | A105+ENP | SS304 | F22 | SS304 | SS316 | SS304L | SS316L |
| Stem | A105 | F304 | F6a | F304 | F316 | F304L | F316L |
| Seat/Seat Ring | PTFE/RPTFE/NYLON/DEVLON/PEEK or METAL | ||||||
| Packing | Graphite/PTFE | ||||||
| Gasket | SS304+Graphite/SS304+Graphite | ||||||
| Bolts/Nuts | B7/2H | L7/4 | B16/4 | B8/8 | B8M/8M | B8/8 | B8M/8M |
| Suitable Medium | W.O.G etc. | HNO3, CH3OOH etc. | |||||
| Suitable Temperature | -29~425 °C | -46~340 °C | -46~340 °C | -196~427 °C | -196~427 °C | -196~427 °C | -196~427 °C |
FAQ
Q: Is there any MOQ requirement?
A: For some small sizes, such as 2''-48'' (DN50-DN1200), the minimum order quantity of each size is required to be 50 pieces. Generally speaking, it depends on your order.
Q: How about the warranty?
A: The warranty time is 12 months after leaving the factory. We can repair or replace due to quality problems.
Q: Payment
A: Mainly T/T, payment terms: 30% advance payment, 70% balance paid before shipment or against the copy of the bill of lading.
Q: Can you manufacture valves of different standards according to customer requirements?
A: Yes. We can manufacture API, DIN, GOST standards of different pressures, temperatures and sizes according to different needs.
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