A swing check valve consists of a valve body, a valve cover, a valve disc, and a rocker arm. The valve disc is disc-shaped and rotates around the pin shaft outside the valve seat channel.
The opening and closing principle of a rotary check valve relies on the action of fluid pressure and the self weight of the valve disc. The opening and closing method of the valve disc is rotational motion, and the inlet direction of the fluid should be on the side that can impact the rotation of the valve disc.
The closing element of a rotary check valve is a valve disc or disk with a diameter equivalent to the pipeline, suspended in the valve chamber. When the fluid flows forward, the valve disc opens under the action of fluid pressure, and when the pressure drops, the valve disc closes under the action of its own weight and the pressure of the backflow fluid.
Rotary check valve is an effective one-way check valve that prevents backflow when water is stopped. Due to its unique design and construction, it will not affect the service life of the water pump by causing a cut-off area. Therefore, rotary check valve, also known as "large diameter full basin" check valve, is a preferred universal valve in fire and municipal pipelines.
The swing check valve is made of ductile iron material, which has the advantages of tensile and crack resistance. The sealing surface has two sealing forms: brass welding or EPDM rubber sealing. Suitable for different occasions in pipeline networks, the valve body is coated with epoxy resin to ensure that water quality and service life are affected by fluid corrosion. The valve plate guide shaft is made of 304 stainless steel to effectively prevent rotation failure caused by fluid corrosion, which may result in damage or destruction of water pumps and other facilities, leading to unexpected secondary serious problems.