Product Introduction

This product is a new type of check valve developed by our factory's technicians with reference to advanced domestic and foreign counterparts. It features a novel structure, rational design, excellent sealing performance, low fluid resistance, large flow rate and long service life. Equipped with a duct control system on the main valve, it operates automatically via hydraulic power to achieve optimal opening/closing speeds, thereby preventing water hammer and water impact. It realizes slow-closing and noise reduction, making it an ideal choice for water supply systems in high-rise buildings. Welcome to purchase!

Product diagram of 300X piston type slow closing check valve

This valve has the characteristics of novel structure, reasonable design, good sealing effect, low fluid resistance, high flow rate, and long service life. Due to the installation of a conduit control system on the main valve and the use of hydraulic automatic operation, the main valve can achieve the optimal opening or closing speed, thereby preventing the occurrence of water hammer and water hammer, and achieving the effect of slow closing and noise reduction.

Working Principle

When the water pump starts operating, the water flow at the inlet end of the valve passes through the micro filter (16), needle valve (15), and check valve (14) into the control chamber of the valve cover, and then is discharged to the outlet through the ball valve (6). Since the opening of the needle valve (15) is small (usually 1/4 turn open is sufficient) and the diameter of the inlet pipe is smaller than that of the outlet pipe, the discharge speed in the control chamber is greater than the water supply speed at the inlet. As a result, the pressure in the control chamber decreases, and the inlet pressure acting under the main valve disc (5) lifts the main valve disc, thereby opening the main valve to supply water downstream.

When the water supply stops, the water downstream starts to flow back. Due to the self-weight of the valve disc (5) and the pressure in the upper water chamber, the throttle port is quickly closed by 90%. The remaining 10% uses the pipe to transmit the pressure behind the valve to the upper water chamber. Due to the action of the check valve (14), the water in the upper water chamber cannot flow out, so the pressure in the water chamber gradually increases, and the valve stem moves down slowly, finally making the main valve disc close tightly. This prevents the backflow of downstream water and plays the role of slow closing and noise elimination. (This is the working principle of the diaphragm type, and the piston type is the same.)

Structural diagram of 300X piston type slow closing check valve

This valve mainly has two types: diaphragm type and piston type. It consists of a main valve, check valve, needle valve, ball valve, micro-filter, pressure gauge, etc. Since the pilot valve, needle valve, pressure gauge, etc., need to be connected to the main valve via ducts, they are collectively referred to as the duct control system.

Main Parts and Materials

Main Technical Performance

Outline Dimension Drawing of 300X Piston Type Slow-Closing Check Valve

Outline Dimension Table of 300X Piston Type Slow-Closing Check Valve