Rubber Flap Check Valve Nbr Disc 4 Inch

NBR rubber valve disc is oil and water resistant, suitable for conventional media such as water and oil; EPDM rubber valve disc is acid and alkali resistant, aging resistant, and can be used in sewage treatment and weak acid and weak alkali medium transportation scenarios.

1. Valve body:

Made of QT450-10 and other grades of ductile iron casting, with a straight through horn mouth design for the flow channel. The inner wall is smooth and the flow area is large, which can reduce the flow resistance of the medium and avoid impurity accumulation; The main connection method is flange connection, and some small caliber models can be customized with clamp connection to meet different pipeline installation requirements.

2. Rubber valve disc:

Made of nitrile rubber (NBR) or ethylene propylene diene monomer (EPDM) molded, integrated with the sealing surface of the valve seat, without hinges, shafts or other moving parts; The valve disc is umbrella shaped or petal shaped, with excellent elasticity and wear resistance. When opened, it can fully adhere to the inner wall of the valve body without affecting the passage of the medium.

3. Limit device:

Equipped with a stainless steel limit block, it can limit the maximum opening angle of the valve disc (usually 60 °~70 °), prevent excessive deformation or damage of the valve disc caused by high-pressure medium impact, and ensure precise alignment when the valve disc is reset.

Standard export wooden case packaging

Versatile enough for urban water supply and drainage, sewage treatment, fire protection systems, HVAC, water treatment plants and farmland irrigation, this valve excels in low-pressure, high-flow pipeline systems with media containing small quantities of impurities. It has established itself as the go-to anti-backflow valve choice for civil buildings and municipal engineering projects.