The AH42F safety reflux valve is a composite valve that integrates safety relief and medium reflux functions. It is typically installed at the outlet of a pump or on pipelines requiring pressure protection. When the pipeline pressure exceeds the set safety value, the valve opens as a safety valve to relieve pressure. When the pump suddenly stops or the downstream pressure is higher than the upstream pressure, the valve can act as a check valve to allow limited reflux of the medium, preventing water hammer, system backflow, and pump reversal. The "F" in the valve model indicates that the valve seat sealing surface is directly machined from the valve body material. This valve simplifies pipeline design and provides integrated safety protection and hydraulic control for pumps and pressure systems. It is mainly installed in the outlet pipelines of centrifugal pumps, water supply systems, fire pump sets, irrigation systems, and industrial circulating water systems. It is used to prevent system overpressure, avoid the hazards of water hammer during pump shutdown, and prevent damage to the pump caused by medium backflow. It is a commonly used multifunctional protection valve in pump pipelines.

AH42F Safety Relief / Reflux Valve Product Diagram

1. Dual function of safety pressure relief and backflow

Integrate the functions of a safety valve and a check valve into a single valve body. The system is protected by releasing pressure in case of overpressure; it allows controlled backflow when the pump stops or the backpressure is too high, preventing water hammer and pump reversal.

2. Valve body sealing surface (Type "F")

The sealing surface is directly machined or built up by welding from the valve body material, which is economical and durable, suitable for non-corrosive media such as water and oil.

3. Spring-loaded, reliable action

The spring direct load mechanism is adopted to provide stable opening pressure and return opening pressure, ensuring sensitive and reliable action.

4. Compact structure, simplified piping

One valve serves two functions, reducing the number of valves required on the pipeline, saving installation space and costs, and simplifying the system.

5. Easy to maintain

The structure is relatively simple, with fewer wearing parts, making maintenance and inspection more convenient.

AH42F Safety Relief / Reflux Valve Structural Diagram

Part Name Material

Performance Specifications Table

AH42F Safety Relief / Reflux Valve Outline Drawing

Dimension Chart