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Ball check valve
May 17, 2018

Ball check valve is a kind of stop valve with multi-ball, multi-channel, multi-cone inverted fluid structure. It is mainly composed of front and rear valve body, rubber ball, and cone type body.

      Check Valve Overview: Check valve is used to open the pipe system media, when the flow of the closure of the automatic valve, the main role is to prevent the back of the media, pump and drive machinery to reverse, to prevent the sudden stop of the pump and drive motor Water hammer waves are generated to reduce the damage to the piping system. The relative displacement of the check valve according to the closing part and the valve seat can be divided into five categories: lift type, swing type, disc type, diaphragm type and ball check valve. For the above-mentioned valves, most of them have the following drawbacks: “big noise” and vibration due to the action of water hammer when they are closed; due to valve plate vibration, mechanical frictional motion occurs between the “joint parts” shaft and the sleeve in the valve. When the vibration frequency of the valve plate is too high, mechanical friction will occur between the shaft and the shaft sleeve. The valve plate will be displaced and the seal will fail. Sometimes the valve plate will fall off and the system protection will fail. The fluid flow in the valve will be disordered and the flow resistance loss will be high. , serious energy loss and so on. In order to avoid and improve the above drawbacks, ball check valves have been applied and popularized due to their superior sealing performance and extremely small flow resistance. Their structure has been gradually improved from the original “single ball” check valve to “multiple Flow path multi-ball check valve.

      Check valve is one of the most common types of equipment for fluid transmission. The existing check valve has the problems of large resistance and large energy consumption. Reducing the flow resistance coefficient is an important way to save energy in fluid transmission. Common check valves include ball check valves, wafer check valves, and the like. The common disadvantage of these check valves is that when the fluid flows in a positive direction and the check valve is open, some components of the check valve, such as flaps or spheres, are in the center of the flow channel and there is a certain water retaining area for the fluid. The flow resistance is large, so that the outlet pressure is reduced, thus wasting energy.

      Structure and working principle: Ball check valve is a multi-ball, multi-channel, multi-cone inverted structure of the check valve, mainly by the front and rear valve body, rubber ball, cone body and other components.

       Its working principle is: the rubber ball makes a short stroke rolling in the dome cover to realize the opening and closing of the valve. When the water pump starts to move, the water flushes the rubber ball under the action of the pressure, so that the rubber ball rolls to the right side. The cone body in the rear valve body fixes its position and the check valve opens; after the pump stops, due to the pipeline system Backwater pressure forces the rubber ball to roll to the left front body, closing the check back. The rubber ball adopts a hollow steel ball and the rubber with good elasticity not only ensures the seal, but also can ensure the reduction of the damage to the pipe system during the valve closing process. The perforated cone body plays a fixed role for the steel ball when the valve is opened and eliminates the pressure of the contact area between the rubber ball and the cone body, making the contact surface contact and reducing the hydraulic loss caused by the shaking of the rubber ball in the valve body.

       Structure: Multi-channel ball check valve is a kind of multi-ball. The non-return valve with multi-channel and multi-cone shaped fluid-conducting structure has a simple structure and is mainly composed of front and rear valve bodies, rubber balls and cones.

       The rubber ball adopts a hollow steel ball, and the rubber with good elasticity not only guarantees sealing, but also ensures to reduce the damage to the pipe system during the valve closing process. The taper of the hole has a fixed effect on the steel ball when the valve is opened, and eliminates the pressure of the contact surface between the rubber ball and the taper so that the contact is a surface contact and reduces the hydraulic loss caused by the shaking of the rubber ball in the valve. The use of three-passage or four-passage ball check valves in large piping systems can replace large valve plate structures, reducing the weight of the valve plate, making the inner flow channel a stand-alone porous structure, with the spheres placed in each hole, the liquid being Into the valve body and out of the flow each step, do not interfere with each other, reduce the impact of the valve closing process and vibration, reduce noise, and completely eliminate running ball failure. Non-joint parts in multi-channel ball check valves (shafts and bushings exist, no relative mechanical friction movement, no consumables compared to swing check valves, long service life, and no maintenance work.

       Structure and principle: The energy-saving hammer ball check valve is simple in structure and mainly consists of a spherical device and a valve body. The spherical device is composed of a spherical cover and a rubber ball. The rubber ball is processed into a core by a steel plate and is lined with a rubber layer to maintain a certain elasticity and sufficient strength. The working principle is that the rubber ball makes a short stroke rolling in the dome cover to achieve the opening and closing of the valve. When the water pump starts to move, the pressure of the water flushes the rubber ball, causing the rubber ball to roll to the right, and the check valve opens; due to the system's return pressure after the pump is stopped, the rubber ball is forced to roll to the left and the check valve closes.

        Check valve advantages:

       (1) Long service life, stable operation, safety and reliability, and good sealing performance;

       (2) The resistance coefficient is small. Due to the spherical valve, the flow of water passes almost straight through the valve body;

       (3) The shock absorption effect is good and the water quality requirements are not strict.


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