What is a Check valve?

There are many distinct varieties of check valves, and they may each be used in a different set of circumstances. Check valves are often seen as components of everyday goods found in homes. Check valves are often relatively easy to use and quite affordable, even though their sizes and prices may be found in a broad variety of configurations and price points. Most check valves are self-regulating, meaning that they are not operated by a human or any other external control. As a result, most check valves do not have a valve handle or stem. The majority of check valves have bodies, also known as their outer shells, that are constructed of either metal or plastic. Cracking pressure is an essential term in checking valves. It refers to the minimal disparity in upstream pressure between the intake and the outlet at which the valve will begin to function. In most cases, the check valve will be constructed for, and therefore be able to be specified for, a certain cracking pressure.

A check valve sometimes referred to as a one-way valve, is a device that is used to restrict the flow of fluids to just one particular direction. The basic function of a check valve is to stop any backflow that may occur in the system. Check valves are answers to possible problems that are not only simple but also relatively inexpensive and effective. Backflow can be problematic if the flow itself is polluted, which would then induce contamination of the medium farther upstream. For instance, a sewage line will contain a non-return valve to guarantee that waste may exit the system but cannot go back into the system from which it originated.

How does a Check valve work?

A check valve requires a particular level of pressure upstream before it can open and let media pass through it. This is necessary for the valve to function properly (the difference in pressure between the inlet and exit). The “cracking pressure” of a check valve is the upstream pressure at which the valve will open with the least amount of force feasible. This is the lowest pressure at which the valve will crack open. Because the specific breaking pressure varies according to the valve type and size, you need to make sure that the pressure in the system is sufficient to create the cracking pressure of the check valve that you have selected. This is because the particular breaking pressure varies according to the valve type and size (s).

If the pressure upstream falls below the cracking pressure or there is back pressure (flow trying to transfer from the outlet to the inlet), the check valve will close. This occurs when the flow is attempting to move from the outlet to the inlet. When the flow is attempting to go from the exit to the intake, this phenomenon occurs. When the check valve is closed, there is often a gate, ball, diaphragm, or disc that is pressed up against a seal. In certain cases, the disc is also pressed up against the seal. Depending on the circumstances, the check valve could additionally have a disc. Gravity or spring may assist in the task of closing the door. If the intake pressure falls below the cracking pressure, the valve will close as a result of gravity, the spring, and/or the back pressure. Regardless of whether or not there is existing backpressure present, the valve will shut.

Check valve selection criteria:

To ensure the security of the tools and machinery found in plumbing systems, check valves must be installed. They’re functional, straightforward, simple to set up, inexpensive, and adaptable to a wide range of settings and tasks. On the other hand, if the incorrect check valve is used, none of these advantages will be realized. Saving money also depends on making the right choice. You should think about these things before settling on a check valve.

In addition to its many other uses, a check valve is often installed on pipes that carry wastewater, sewage, chemicals, or water. The valve’s design and manner of operation are determined by the intended use. Ball valves, for instance, may be used in wastewater treatment since they do not obstruct the flow. However, their sluggish shutdown speeds hinder their performance in chemical mixing applications.

Critical Pressure, often known as the Lowest Safe Operating Pressure,

A check valve must be installed with enough cracking pressure for its size. When the cracking pressure of a valve is too high, the fluids passing through it may be unable to open it. However, if the cracking pressure is too low, the check valve will not open.

You may get valves in a wide range of sizes. The chosen check valve’s dimensions must be compatible with those of the pipes and other components.

Advantages of Check valve:

The use of  check valves is associated with several benefits and advantages, some of which include the following:

  • Protect pumping and compressing equipment from the potential hazards caused by backflow and reverse flow by installing appropriate safety measures.
  • Reduce production losses and downtime that are brought on by the failure of valves that are not appropriate in their function.
  • Decreases in energy usage as a result of a lessening of the pressure drop
  • Check valves are particularly helpful in reducing the likelihood of a sudden valve failure, decreasing chatter, and avoiding water hammers.
  • A decrease in the costs associated with maintenance; in comparison to ours, conventional check valves have fewer moving parts and more compact in size.
  • Flexibility in the face of fluctuating flow conditions compatibility with the vast majority of traditional swing check valves, all without the need for expensive pipe modification adaptability to cope with constantly changing flow conditions.

Applications of Check valve:

  • Some pumps need the use of check valves. Ball check valves are extensively used as input and outlet fittings on piston-driven and diaphragm pumps, including metering pumps and chromatography pumps. These valves are located on the intake and outflow lines of the pump head and resemble tiny cylinders. Ball check valves are a common kind of check valve used in pump-like systems. Steam boilers have check valves installed on the feed pumps or injectors that give the water to the boilers.
  • The water slides’ supply pumps also have check valves to prevent any water from leaking out. A tower housing the slide’s stairs also function as the pipe carrying the water to the slide. When the slide’s host facility shuts for the night, a check valve closes, preventing water from rushing down the pipe. When the facility opens for business the following morning, the valve is released, and the water flow resumes, making the slide usable once again.
  • Numerous industrial processes use check valves since they are often utilized in fluid systems like those found in chemical and power plants.
  • Common uses in the nuclear sector include control systems for feed water, dump lines, make-up water, various process systems, N2 systems, and monitoring and sampling setups. Check valves are employed in aerospace and aviation where there is the potential for significant vibration, wide temperature swings, or corrosive fluids. Reaction control systems (RCS), attitude control systems (ACS), hydraulic systems, and the propulsion of spacecraft and launch vehicles are all examples.
  • When combining different gas streams into one, check valves are often used. Each separate gas line is equipped with a check valve to avoid any potential for a mingling of gases at the source. To prevent the original gas cylinders from being contaminated, check valves are often installed on both the fuel and oxidizer sources before they are combined.

From where to buy the best Check valve?

The best option available is GMK. Our company specializes in the production of various kinds of hydrants and accessories, as well as gate valves, double eccentric butterfly valves, ball check valves, service connection valves, Supa MaxiTM couplings, extension spindles, and other similar products. We utilize rubber compounds because it is very necessary for the rubber components found within the valve and the hydrant to be of the highest quality in order to guarantee a safe, watertight seal and problem-free functioning.

Why GMK?

The comprehensive technical information center that can be found on GMK’s website provides you with the opportunity to get a comprehensive understanding of the items before making a purchase and assists you in making an informed decision. You may get in touch with us by telephone or electronic mail if you are unable to locate the information you want on our website or if you would like to speak with an engineer. We will do our best to answer all questions within one business day.

What Globe valve GMK offers:

When a check valve is needed to prevent backflow, GMK has a complete line-up, including the Butterfly Buffering Check ValveDIN Swing Check ValveGMK Integrated Lug Type Double-disc Swing Check Valve.


Our clients are handled by local sales organizations within AVK’s own sales firms or by our carefully chosen distributors, who take an active interest in the requirements of their own customers. As a result, we are able to provide customized solutions that are tailored to the particular requirements of each location.