application

Almost all conceivable pipeline or fluid transportation applications, whether industrial, commercial or domestic, use check valves. They are an indispensable part of daily life, although invisible. The sewage, water treatment, medical treatment, chemical processing, power generation, pharmacy, chromatography, agriculture, hydropower, petrochemical and food and beverage processing industries use check valves in their daily operations to effectively prevent backflow. Because they prevent product failures and do not require supervision during operation, check valves are not only desirable, but are usually required by law to ensure the safety of water, gas, and pressure applications.

At home, they help to start and stop liquid flow. They are used in water heaters, indoor piping, faucets and dishwashers, as well as more advanced equipment such as metering pumps, mixers, mixers and flow meters. Industrial check valves monitor systems in nuclear, factory, chemical plant, aircraft hydraulic systems (vibration temperature and corrosive materials), spacecraft and launch vehicle systems (reaction control, propellant control, altitude control), and air flow control systems (prevention of gas mixing)

features

Check valves are becoming more and more popular because of their simple design and ease of use. The mechanism is quite simple. As previously mentioned, the operation of the check valve is completely determined by the process flow, which means that no additional actuator is required. Typically, the valve acts as a cylindrical device connected to the pump head on the inlet and outlet lines. The working device with openings at both ends crosscuts the shell and divides the shell into upstream and downstream parts. The valve seat extends from the cylinder wall, but has an opening suitable for the process flow.

Ball, cone, disc or other oversize device rests against the valve seat on the downstream side of the check valve. The limited mobility prevents the plugging device from being flushed downstream. When the fluid moves in a predetermined direction under the necessary pressure, the plug is removed from the valve seat and the fluid or gas is allowed to pass through the resulting gap. As the pressure drops, the plug returns to the seat to prevent backflow.

Gravity or stainless steel spring loading mechanisms are usually responsible for this return movement, but in some cases, the increased pressure on the downstream side of the valve is sufficient to move the equipment back to its original position. The closure of the valve prevents downstream material from mixing with upstream material even when the pressure increases. The specific plugs used vary depending on the type of check valve installed. As the name implies, ball check valves use balls. Lift check valves use cones or discs attached to rod guides to ensure that they return to the correct position on the valve seat. Swing and wafer valves use one or more discs to seal the gap in the seat.

Advantages of check valve

Check valves have many advantages. First, they can control psi flow in various industrial sectors. In fact, they can work at a high enough psi pressure to extinguish the fire, and the psi pressure is controlled enough to work in the scuba cylinder. Another advantage of check valves is that they prevent cross contamination of fluids, including fresh water.