Check valve for water for the pump: overview, varieties, installation and specifications

If you are interested in the question of what a check valve is for water for a pump, then you should know that this is an important part of the system. Most often it is installed in pipelines to ensure the movement of steam, liquid or gas. All this should take place in one direction. The valve will not allow the liquid to move back in the direction that is opposite to the existing one. Installation of this element for the pump in various systems is carried out in the case when there are a number of factors that create counteraction to the movement of the liquid.

Overview of the valve

The water return valve for the pump is a cylinder that is provided with a spring inside. There is also an overlapping round plate. Initially, this element is closed due to the presence of a spring. However, under the influence of water, the spring weakens, the valve opens, making it possible to pass the flow of water through itself. If the flow is weakened by leakage, stopping the pump, or some other reason, the overlapping plate closes, and the spring acts on it. If water is not pressurized, the valve does not allow it to move back. A non-return valve is necessary to prevent water from flowing back into the well or other source of water when the pump is stopped. If there has been a power failure or the pump has shut down, there is no need to refill the entire system with water. When selecting this item, you should consider that its size is indicated in inches.

Valve characteristics

When considering a check valve for water for a pump, you should be aware that among its characteristics there is a nominal diameter, which is also called the diameter of the aperture. This indicator is conditional and does not correspond to the through diameter of the pipe. In addition, you must consider the thickness of the walls of the pipe. The size of the check valve varies from 15 to 200 millimeters.

Varieties of check valves

The water return valve for the pump may have certain characteristics by the attachment method. Distinguish these products for this particular feature. For example, they can be designed for fixing by welding to polypropylene pipes, using flanges to the pipeline system, and also by means of a threaded coupling, called a coupler attachment. The installation can also be carried out by an inter-flange method, when the valve is clamped between the flanges of the pipeline system.

Difference by type of device

The described part of the system can be represented by a valve or a return gate. They differ from each other in that the check valve has a spool as an internal septum, while a reverse disc is fitted to the return gate, which acts as a shutter. It can be a shock, which involves the use of an appropriate closing technique, this is in no way able to affect the operation of the system. This component of the valve can be unstressed, it closes gently. The closures are made of titanium, bronze, steel, brass, non-metallic materials or cast iron. Depending on the method of execution of the closure, the check valves can be divided into those that have lifting, ball, swivel or wafer type. If it is a lifting check valve, then under the influence of water pressure the element rises, weakening the pressure of the spring. Ball type valves work on the basis of a ball, which blocks the flow if necessary. The rotary type of the non-return valve assumes a flap. The wafer-type valve has a leaf or disc, one of which prevents water from flowing back.

Types of check valve

If you are considering a variety of check valves for water, you should pay attention to V 275 Do 15-100. It is able, first of all, to protect the water supply system from the reverse flow. The maximum permissible temperature of its operation is 250 degrees. The body is based on brass, the permissible pressure is equivalent to 16 bar. It is worthwhile to consider the check valve V6516 (DN 50-500, PN 10), which fulfills its main tasks and can be installed in the pipeline system, through which not only ordinary water but sewage and technical water is transported. You can use this element even at a minimum temperature of 70 degrees, the allowable pressure is 10 bar. At the heart of the body is cast iron. On sale, you can find a rotary valve "Granlock", which is an interclass device. The permissible temperature is 110 degrees, the maximum pressure at which the valve is able to operate is 16 bar. The case is based on stainless steel. Specialists often choose the RD50 ° F lifting flanged return valve. It is able to protect the water supply system from the reverse flow, it can be operated with a wide temperature range, and the maximum permissible value is 350 degrees. The body is based on steel, the maximum pressure that the valve can withstand is equivalent to 40 bar.

Key Features

Once you understand how important it is to use a non-return valve for water, you need to take into account that among the advantages of wafer devices is not only a small size, but also a light weight. They can be installed horizontally, inclined and vertically. The reverse flanged valve is installed in many cases with polypropylene pipes. They must be mounted in the direction of the flow of water. If the pump stops operating in the event of an emergency, a hydrostatic shock can occur, which damages the hydraulic system. In this case, experts recommend using two-leaf valves. When the water stream rushes back, the flaps do not allow the penetration of the liquid, as they fold up. The diameter of such valves can vary from 50 to 700 millimeters.

Characteristics of back and ball valves

A check valve for water for a pump, the price of which is quite acceptable, can have a diameter of up to 400 millimeters. It is used in those systems where the impact of the closure does not damage the further operation of the hydraulic system when the pump is stopped. In hydro- and air systems of impressive size, unstressed rotary valves are installed. It differs in that it is not exacting to water pollution. If you are thinking about where and how to install a check valve for water, you can use the ball-shaped version of the described product. It is most often used in plumbing. It should be installed only vertically, it is sensitive to the cleanliness of the external environment.

Installation

The non-return valve for centrifugal pumping units with bypass is an indispensable element. With its help, overlapping occurs when the fluid moves through a small circle. The device is installed between suction and discharge pipelines. The hole of the return pipe is covered by the rubber ball of the valve. This action forces the fluid to pass through the pump.

Cost

Check valve for submersible deep-water pump you can find on sale at a price of 7 to 12 dollars. As for ball valves, they are cheaper, for one product you will have to pay no more than $ 7. Lifting valves can be purchased for 16-19 dollars. As for the spool models, in the stores they are sold at a cost of 10 to 12 dollars. If the installation of a non-return valve is to be done manually, the instruction must be examined by you in advance. However, it is first necessary to get acquainted with the cost It should be noted that the above prices were specified for models intended for domestic use.

They differ in that their diameter is not more than 1.5 inches. As for industrial valves, their cost will be increased several dozen times. The cost will depend on the materials used, design features and dimensions of the valves.

Conclusion

If you do not take care of installing a check valve, then in the mixer because of the impressive pressure, hot water will certainly fall into the tap with cold water. Among other things, the vibration caused by the flow of water will lead to a more intense rotation of the counter, causing non-existent waste.