Reducing Valve and Relief Valve

The Role and Difference between Pressure Reducing Valve and Relief Valve

The role of relief valve and pressure reducing valve

The relief valve is to prevent the system from being overloaded to ensure safety. Pressure reducing valve is to reduce the system pressure under the premise of ensuring that the system is not overloaded.

It can be said that the relief valve is working passively, while the pressure reducing valve is working actively.

1、The pressure reducing valve keeps the pressure at the outlet constant, while the relief valve keeps the pressure at the inlet constant.

2、When it is not working, the pressure reducing valve’s import and export are interchangeable, while the relief valve’s import and export are not accessible.

3、In non-working condition, the valve port of pressure reducing valve is open, while the relief valve is normally closed.

Pressure Reducing Valve

The difference between relief valve and pressure reducing valve

Relief valve is a pressure control valve, mainly to control the system pressure, but also play a role in unloading.

Pressure reducing valve is a pressure regulating valve that makes the valve outlet pressure lower than the inlet pressure.

1. Pressure reducing valve is mainly used to reduce the pressure of a branch of the hydraulic system, so that the branch pressure is lower than the main line pressure and stable, in the range of the adjusted pressure, pressure reducing valve is also closed, like the relief valve. However, as the system pressure rises, when it reaches the pressure set by the pressure reducing valve, the pressure reducing valve will open and part of the oil will return to the tank (at this time, there is a certain pressure of the oil back to the tank, the oil temperature of the tank will rise), and the oil pressure of this branch will not rise. It plays the role of pressure reduction and pressure stabilization of this branch. The relief valve is different, it is installed at the outlet of the pump to ensure that the overall pressure of the system is stable and will not overpressure. So he has the role of safety, pressure regulation, pressure stabilization, etc..

2. The relief valve is generally connected in parallel in the system branch to regulate, stabilize and reduce pressure, while the pressure reducing valve is generally connected in series in a road to reduce pressure and pressure-keeping the role of the branch.

The relief valve is normally closed, only when the system overpressure action; pressure reducing valve is normally open, through the narrow channel to reduce pressure.

The role of the relief valve is: pressure stabilization, overflow, overload protection. Pressure reducing valve is to reduce the pressure, the pressure of a part of the hydraulic system is reduced. The uses are not the same, so they cannot be replaced.

The relief valve controls the inlet pressure and the pressure reducing valve controls the outlet pressure.

High Pressure Self Actuated Regulating Pressure Reducing Valve

The high pressure self regulating pressure reducing valve is suitable for the oil, water, air with low corrosivity and fluidity, and non-corrosive gas and steam with a temperature below 350 °C. For high temperature and high turbidity medium, accessories such as condensers and isolation tanks need to be installed. This high pressure self actuated pressure reducing valve is widely used in regulating control under continuous use of medium for natural gas transportation, urban heating and metallurgy, petroleum, chemical, electric power, etc.

The information is provided by the pressure reducing valve supplier.

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