Flange Type Non Return Valve

At key locations such as crude oil pipeline pump outlets, chemical reactor feed lines, and water supply pumping stations, the reverse-flow impact caused by a sudden pump shutdown can not only reverse the impeller but may also tear pipeline welds or cause flange sealing failure.

This flange type non return valve from Chenxiang adopts a flanged connection, making on-site installation and maintenance faster and easier. Its valve disc opens automatically under the force of forward medium flow and closes by itself under gravity or spring force when reverse flow occurs. The entire process requires no external power supply or manual operation, fundamentally eliminating the risk of backflow.

The flange type non return valve is widely suitable for petroleum, chemical processing, natural gas, light industry, power generation, pharmaceuticals, metallurgy, water supply, military industry, and other sectors. It can handle compressed air, natural gas, coal gas, liquefied gas, nitrogen, oxygen, hydrogen, steam, flue gas, and various process tail gases.

Material options include forged steel A105, F304/F316L, F22, and LCB. Connection types include RF, FM, G, M, and RTJ, while hard sealing options include H, W, and Y. Structurally, both lift-type and swing-type designs are available. The lift-type design offers precise guidance and rapid shutoff, making it suitable for high-pressure, small-diameter applications. The swing-type design provides high flow capacity and low pressure loss, making it suitable for low-pressure, large-diameter applications.

During quality control, each valve undergoes opening pressure testing and reverse sealing testing. In addition, a submersible pressure testing machine is used to fully immerse the valve in water, allowing reverse leakage points to be visually inspected under pressure. A hardness tester is also used to check the surface hardness of the valve disc and valve seat sealing surfaces on each unit, ensuring that the sealing pair is resistant to wear and erosion.

For lift-type structures with springs, dedicated equipment is used to test the spring force one by one, ensuring that the valve disc can still open fully even at extremely low flow rates. Chenxiang provides a complete factory inspection report and installation guidance for this flange type non return valve, with remote technical support available for troubleshooting and consultation.

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