The inlet vacuum back pressure valve is a valve that controls the fluid pressure, and its function is to set a fixed back pressure in the piping system, so as to control the flow and pressure. It is usually installed at the outlet end of the equipment and can control the direction and speed of the flow of liquids or gases in the pipeline. In some cases, an inlet vacuum back pressure valve can also be used to prevent backflow of the system.
Imported vacuum back pressure valves can be divided into direct back pressure valves and indirect back pressure valves. A direct back pressure valve is to put the pressure on the spring and control the pressure by adjusting the preload of the spring so that the flow rate remains constant. The indirect back pressure valve sends the back pressure signal to the controller, and then the controller sends instructions to the actuator to control the opening of the valve, so as to achieve the purpose of controlling pressure and flow.
Imported vacuum back pressure valves are widely used in chemical industry, electric power industry, food industry, petroleum industry, environmental protection engineering and other fields. In the chemical industry, imported vacuum back pressure valves are usually used to protect production equipment and product quality;In the power industry, it can control the back pressure of the steam system to ensure the safe and efficient operation of the generator setIn the food industry, imported vacuum back pressure valves can be used to protect filling equipment and adjust filling speed.
The pressure after the inlet vacuum back pressure valve is not necessarily atmospheric. This is because in the process of installing the inlet vacuum back pressure valve, it is necessary to determine the valve setting value of the inlet vacuum back pressure valve according to the specific working scenario, so as to achieve the purpose of controlling the flow and pressure. If the valve setpoint is set too high, the pressure after the inlet vacuum back pressure valve will be higher than the atmospheric pressureConversely, if the valve setpoint is set too low, the pressure after the inlet vacuum back pressure valve will be lower than atmospheric pressure. Therefore, the pressure after the inlet vacuum back pressure valve depends on the specific operating scenario and the valve setpoint.
The parameters of the inlet vacuum back pressure valve include:
Maximum inlet pressure: 28 inHG Vacuum-15 psig, 0-50, 0-100 and 0-150 psig.
Design test pressure: 150% of the maximum rated pressure.
Leakage: No gas leakage inside, 2 x 10-8 atm·ml helium outside.
Ambient operating temperature: -40° F to +446° F, -40° C to +230° C.
Rated flow: CV = 004。
Material in contact with the medium: 316 stainless steel body, nickel-plated brass bonnet, Teflon or PEEK seat, 316 stainless steel spring and main valve, 316 stainless steel partition, 316 stainless steel for the rest of the components.
Weight: Usually 125 kg。