How To Select A Low Pressure Valve

The selection of a low pressure valve should take many factors into consideration, from size and material to operating temperature. The material must be compatible with the fluid, as well as the operating environment. Typical seal materials are Buna-N, but some manufacturers offer additional options such as EPDM, silicone, or perfluoroelastomer. In addition to material choice, there are several other important factors to consider, including the operating temperature and corrosive fluids.

A pressure relief valve uses a spring-loaded "poppet" element with a thermoplastic or elastomeric seal. The poppet moves away from the valve seat when the upstream pressure is high and opens the outlet port. When the upstream pressure falls below the set point, the poppet closes. Typically, a single-piece pressure relief valve has a range of 10 to 40 psi. However, in the event of multiple pressures, the pressure relief valve may be multiple-staged.

Pressure override allows you to manually control the pressure of a water line without shutting off the main supply. Although pressure override is beneficial in some applications, it can be harmful if it wastes power. Often, the gas will flow through the valve before it reaches its maximum setting, allowing the system pressure to exceed the component ratings. However, it is essential to note that there are many different types of low pressure valves.

The LPR2 ultra-low pressure regulator controls pressures ranging from 0.25 to 7 inH2O. This model is suitable for low-flow applications, such as testing. Its full-scale pressure ranges are 0.3 to 20 millibar(g).

Another type of low pressure valve is an expansion valve. This type of valve removes pressure from liquid refrigerant. In cold climates, the liquid refrigerant can freeze over due to the close proximity of the two components. When the pressure is too high, the valve turns off. Eventually, moisture will accumulate in the system and the expansion valve will fail to function properly. If the high pressure side of the valve is too high, the expansion valve can become clogged.

Unlike high-pressure valves, low pressure valves are designed to open at a preset pressure and discharge the fluid until the pressure falls below that threshold. This safety valve has a fascinating history. It was developed in the late 1800's to save lives, and the history of its development is fascinating. When used properly, a low pressure valve can protect lives and property. In addition to reducing risk, it can save energy and money.

Regardless of the type of low pressure valve used in a system, there are several types of valves available. Pressure-control valves are the most practical component to maintain a low pressure. They are normally two-way valves and close when pressure rises in the downstream circuit. Some are pilot operated, while others are direct acting. Direct-acting valves will only limit the secondary circuit's maximum pressure. Direct-acting valves can also be pressure-sensing. In this type, the signal is coming from the secondary circuit, while pressure-sensing valves will close based on a pressure-sensing signal from the secondary circuit.