The slow acting check valve also called as slow closing valve, is designed for water supply, air conditioning, and fire protection piping systems, suitable for water as the medium with a temperature up to 80°C. The valve utilizes the pressure of the fluid itself to slowly close the main valve core, effectively reducing water hammer effects while providing slow-closing, noise reduction, and check valve functions.

Structural Features

■ Slow-Closing Function: Through the adjustment of valve components, the main valve closes gradually, avoiding the sudden closure that can cause water hammer.

■ Noise Reduction: Due to the slow-closing mechanism, the noise generated during closure is reduced.

■ Backflow Prevention: Prevents reverse flow of water, protecting the system from backflow damage.

■ Component Composition: Includes the main valve, check valve, needle valve, ball valve, and pressure gauge, working together to complete the valve's operational process.

■ Adjustable Closure Speed: Users can control the closing speed of the main valve by adjusting the opening degree of the ball valve (or needle valve), adapting to different operational conditions.

■ High Safety: Designed with a pressure gauge to monitor peak water hammer pressures, helping adjust valve settings to ensure safe system operation.

How do I adjust the closing speed of the main valve?

By adjusting the opening degree of the ball valve (or needle valve) on the pilot line. Increasing the opening will lead to faster closing of the main valve, while decreasing it will make the closing process slower.

What should I do if the peak water hammer pressure is too high?

You can reduce the peak water hammer pressure by slowing down the closing speed of the main valve. This is done by decreasing the opening degree of the ball valve (or needle valve).

What are the consequences if the main valve closing time is too slow?

A too slow closing time may cause the pump and motor to reverse, potentially damaging the equipment. Therefore, attention should be paid to ensure the closing time is not excessively long when adjusting.

Why is it necessary to install a strainer before the main valve?

Installing a strainer prevents debris from entering the pilot line and needle valve, which could cause blockages and affect the normal operation of the valve.