Las válvulas de retención son válvulas automáticas y autónomas que se utilizan para evitar la inversión del flujo en un conducto. Cuando está abierto y bajo la presión del flujo, el mecanismo de retención se mueve libremente por los medios, y ofrece muy poca resistencia y una caída mínima de presión. Asahi/America ofrece dos tipos básicos de válvulas de retención: válvulas de retención de columpio y válvulas de retención de bola. Una válvula de retención de columpio utiliza un disco oscilante, que requiere solo una contrapresión mínima para cerrar la válvula. Esta válvula también puede modificarse, con una palanca y contrapeso, o un muelle, para ayudar a que se asiente más rápido para eliminar el impacto. La válvula de retención de bola Asahi/America emplea una bola de movimiento libre, que se desasienta para permitir el flujo en una dirección, pero se sella contra un asiento para evitar el contraflujo. Ambos tipos de válvulas se pueden instalar verticalmente u horizontalmente.

Wafer check valves have a solid thermoplastic body with a very thin «wafer» profile that makes them an ideal check valve for applications that require valves with short takeout lengths. Similar in operation to a swing check valve, the wafer check has a solid thermoplastic disc and seat arrangement that performs the check action. In one direction, fluid lifts the disc off of the seat and allows fluid to pass freely. In the opposite direction fluid drives the disc into the seat, creating a seal and preventing fluid from back flowing upstream. Because of its slim profile, wafer style checks are unlikely to clog which makes them ideal for service lines with large debris or solids. Wafer check valves are used in applications where it is essential to ensure fluid flow passes in only one direction. Wafer check valves can be mounted in vertical or horizontal directions, with the only restriction being a minimum back-pressure required to properly seat the check valve. Spring assists and lever and weight mechanisms are available options to assist in closing the valve quicker to reduce water hammer concerns.

Ideal Applications Include: Tank inlets/outlets; preventing backflow into a pump; one-way mixing; water hammer mitigation; pressure balancing; process intakes. In the following industries: chemical processing, bleach plants, aquariums, mining, water treatment, landfills, swimming pools, power plants

■ All 3" – 8" wafer check valves operate at a maximum pressure of 150psi, 10" and 12" valves at90 psi and up to 120o F.

■ PVC body with EPDM or FKM seals

■ Slim profile permits easy installation

■ Wafer style fits between 2-mating flanges

■ Face to Face meets ASME/ANSI B16.10

■ No spacer required

■ No pipe interference with disc

■ No bolt pattern – Permits installation using ANSI/JIS/DIN mating flanges

■ Vertical or horizontal installation

■ No external shaft

■ Excellent chemical resistance

Datasheet – Wafer Check Valves
Specifications – Wafer Check Valves
OM Manual – Wafer Check Valves
Drawing (3"-12") – Wafer Check Valves
Drawing (3"-12" with Spring) – Wafer Check Valves
Additional Sizes Press Release – Wafer Check Valves