977HP sealing oil differential pressure valve

Short Description:

The 977HP differential pressure regulating valve is used in the sealing oil system of the generator set by comparing the sum of hydrogen pressure and spring pressure with the oil pressure. When there is a pressure difference, the valve stem moves up and down, which affects the opening of the valve port and makes The flow and pressure at the outlet of the differential pressure valve change accordingly, and the pressure balance is finally achieved. At this time, the pressure difference ΔP between hydrogen pressure and oil pressure is relatively constant, and the pressure difference value ΔP can be adjusted by adjusting the spring. The differential pressure adjustment range of this valve is 0.4~1.4bar.

Send email to us

Product Detail

Performance parameters

The Performance Parameters of 977HP differential pressure regulating valve:

Connections: 2" ANSI Grade 150 steel flat face flange connections.
Differential pressure adjustment range: 6~20 psig (0.4~1.4bar)
1Maximum inlet pressure: 150 psig (10 bar).
Maximum Outlet Pressure: 150 psig (10 bar).
Temperature Range: -20 to 150°F (-29 to 60°C)
Pressure feedback: The external pipeline is connected to the upper and lower pressure ports.

Working principle

The Working Principle of 977HP differential pressure regulating valve:

The hydrogen pressure is introduced above the main diaphragm through the external control pipeline, and the sealing oil pressure is introduced into the lower part of the main diaphragm through the external control pipeline. When the hydrogen pressure increases, the spring drives the diaphragm and valve stem assembly to move down, the opening of the valve port increases, and the outlet flow of the differential pressure valve increases, which increases the sealing oil pressure until it reaches equilibrium near the set differential pressure value ΔP.
On the contrary, when the hydrogen pressure decreases, the spring drives the diaphragm and valve stem assembly to move up, the opening of the valve port decreases, and the outlet flow of the differential pressure valve decreases, causing the sealing oil pressure to decrease until it reaches equilibrium near the set differential pressure value ΔP.