Pressure Reducing valve

Pressure reducing valve is a valve that reduces the pressure to a required outlet pressure through adjustment and relies on the energy of the medium itself to automatically keep the outlet pressure stable. From the perspective of fluid mechanics, the pressure reducing valve is a throttling element with variable local resistance. That is, by changing the throttling area, the flow velocity and the kinetic energy of the fluid are changed, resulting in different pressure losses, so as to achieve the purpose of pressure reduction. Then, relying on the adjustment of the control and regulation system, the fluctuation of the pressure after the valve is balanced with the spring force, so that the pressure after the valve remains constant within the error range.

What is a pressure reducing valve?

A pressure reducing valve is a valve that reduces pressure to a required outlet pressure through adjustment and automatically keeps the outlet pressure stable relying on the energy of the medium itself. From the perspective of fluid mechanics, it is a throttling element with variable local resistance. It achieves pressure reduction by changing the throttling area, fluid flow velocity and kinetic energy, resulting in different pressure losses. Then, with the adjustment of the control and regulation system, the pressure fluctuation after the valve is balanced with the spring force to keep the pressure after the valve constant within the error range.

What are the performance categories of a pressure reducing valve?

Pressure regulation range: It is the adjustable range of the output pressure P2 of the pressure reducing valve. Within this range, the required accuracy should be achieved. It is mainly related to the stiffness of the pressure regulation spring.

Pressure characteristic: It is the characteristic that when the flow rate g is a constant value, the output pressure fluctuates due to the input pressure fluctuation. The smaller the output pressure fluctuation, the better the characteristic of the pressure reducing valve. The output pressure is lower than the input pressure by a certain value and basically doesn't change with the input pressure change.

Flow characteristic: It is the characteristic that when the input pressure is constant, the output pressure changes with the output flow rate g change. When the flow rate g changes, the smaller the output pressure change, the better. Generally, the lower the output pressure, the smaller the fluctuation with the output flow change.

What is the application of pressure reducing valves?

It can reduce the higher liquid pressure in the pipeline before the valve to the required level in the pipeline after the valve. The transmission medium is mainly water. It is widely used in high - rise buildings, areas with excessive water pressure in urban water supply pipe networks, mines and other occasions to obtain appropriate service water pressure and flow for each water consumption point in the water supply system. It also has potential water - saving effects, and its water - saving effect is about 30%.

What are the common types of pressure reducing valve structures?

In the past, the common ones were diaphragm type, internal spring piston type, etc. The basic working principle is to reduce water pressure by the local resistance of the flow passage in the valve to the water flow.