A check valve, also known as a non-return valve, one-way valve, or back pressure valve, is a type of valve that automatically opens and closes based on the force generated by the flow of the medium in the pipeline; it belongs to aautomatic valve. A spherical check valve is a check valve that uses a multi-ball, multi-channel, and multi-conical backflow structure. It is mainly composed of front and rear valve bodies, rubber balls, conical bodies, etc. 

Introduction 

A check valve is an automatic valve used in pipeline systems to open when the medium flows in the forward direction and close when it flows in the reverse direction. Its main function is to prevent backflow of the medium, reverse rotation of the pump and driving machinery, and prevent water hammer caused by the sudden stop of the water pump and driving motor, thus reducing damage to the pipeline system. Check valves can be classified into five categories according to the relative displacement method of the closing member and valve seat: lift type, swing type, disc type, diaphragm type, and spherical check valve. Most of the above-mentioned check valves have the following disadvantages: a "loud noise" and vibration caused by water hammer during closing; mechanical friction between the "articulated parts" shaft and bushing due to valve plate vibration. When the valve plate vibration frequency is too high, mechanical friction occurs between the shaft and bushing, causing valve plate displacement, seal failure, and sometimes valve plate detachment, resulting in system protection failure; disordered fluid flow in the valve, large flow resistance loss, and serious energy loss. To avoid and improve these shortcomings, spherical check valves have been widely used and promoted due to their good sealing performance and extremely low flow resistance. Their structure has gradually improved from the initial "single-ball" check valve to the "independent multi-channel multi-ball" check valve.

Structure and Working Principle

A spherical check valve is a check valve that uses a multi-ball, multi-channel, and multi-conical backflow body structure. It is mainly composed of the front and rearvalve body, rubber balls, and conical bodies. Its working principle is that the rubber ball rolls a short distance in the ball cover to achieve valve opening and closing. When the water pump starts, the water pressure pushes open the rubber ball, causing it to roll to the right side, where it is fixed in place by the conical body in the rear valve body, opening the check valve; after the pump stops, the backwater pressure in the pipeline system forces the rubber ball to roll to the left side of the front valve body, closing the check valve. The rubber ball uses a hollow steel ball with a highly elastic rubber coating to ensure sealing and reduce damage to the pipeline system during valve closing. The perforated conical body fixes the steel ball when the valve is open and eliminates the pressure on the contact area between the rubber ball and the conical body, making the contact a surface contact to reduce the hydraulic loss caused by the vibration of the rubber ball in the valve body.

Product Introduction

The rubber ball uses a hollow steel ball with a highly elastic rubber coating to ensure sealing and reduce damage to the pipeline system during valve closing. The perforated conical body fixes the steel ball when the valve is open and eliminates the pressure on the contact surface between the rubber ball and the conical body, making the contact a surface contact to reduce the hydraulic loss caused by the vibration of the rubber ball in the valve. In large pipeline systems, three-channel or four-channel spherical check valves can replace large valve plate structures, reducing the weight of the valve plate and making the internal flow channel an independent multi-hole structure. The sphere is placed in each hole, and the liquid flows through its own path during the process of entering and leaving the valve body, without interference, reducing the impact force and vibration during valve closing, reducing noise, and completely eliminating the ball running away fault. The multi-channel spherical check valve has no articulated parts, and the shaft and bushing have no relative mechanical friction. Compared withswing check valves, there are no wearing parts, resulting in a longer service life and no maintenance work.

The water hammer-proof energy-saving spherical check valve has a simple structure, mainly consisting of a spherical device and a valve body. The spherical device consists of a ball cover and a rubber ball. The rubber ball is made of a steel plate processed into a ball core and lined with a rubber layer to maintain a certain elasticity and sufficient strength. The working principle is that the rubber ball rolls a short distance in the ball cover to achieve valve opening and closing. When the water pump starts, the water pressure pushes open the rubber ball, causing it to roll to the right side, opening the check valve; after the pump stops, the backwater pressure in the system forces the rubber ball to roll to the left side, closing the check valve.

Advantages

(1) Long service life, stable operation, safe and reliable, good sealing performance;

(2) Low resistance coefficient. Because it is a spherical valve, the water flows almost straight through the valve body;

(3) Good shock absorption effect, not strict requirements on water quality.