Pressure Retaining Valves

The pressure retaining valves V786 and V186/V86 from GF Piping Systems serve to keep the working or system-related pressures constant, to balance out pressure pulsation and to reduce pressure peaks in chemical process systems.

If the inlet pressure rises above the set value, the pressurised valve piston is lifted against the spring force. Consequently, the valve opens and there is a reduction of pressure in the outlet pipe. The valve closes as soon as the inlet pressure sinks below the pre-set spring tension.

Fields of Application:

• microelectronics
• measurement & control
• chemical process industry
• water treatment

Advantages:

• all parts which come into contact with the medium are made of highly resistant plastics
• the actuator is separated and hermetically sealed off from the flow section by the control diaphragm
• the large control surface and the spiral spring keep standard tolerances small
• no auxiliary energy is required to operate the valve
• largely maintenance-free and installable in any position
• can also be adjusted under working pressure

Pressure Reducing Valves

The pressure reducing valves V782, V82 and V182 from GF Piping Systems reduce the pressure within the system to a pre-set value. By using the differential pressure, the pressure reducing valve adjusts itself to the set working pressure.

The outlet pressure (working pressure) is not directly related to the inlet pressure. If the outlet pressure increases or decreases above/below the desired value, the diaphragm is lifted against the spring force or pressed down by the spring force, as the case may be, by the outlet pressure.

The pressure reducing valve begins to close/open until a state of equilibrium is re-established; in other words, the outlet pressure remains constant irrespective of an increasing or decreasing inlet pressure.

Fields of Application:

• microelectronics
• measurement & control
• chemical process industry
• water treatment

Advantages:

• all parts which come into contact with the medium made of highly resistant plastics
• the actuator is separated and hermetically sealed off from the flow section by the control diaphragm
• small standard tolerances due to the large control surface and the spiral spring
• no auxiliary energy is required to operate the valve
• largely maintenance-free and installable in any position
• can also be adjusted under working pressure
• standard version type V82 and V182 with manometer

Pressure Relief Valves

The pressure relief valves V185 and V85 serve to keep the working or system-related pressures constant, to balance out pressure pulsation and to reduce pressure peaks in process systems.

The third pipe spigot fitted on the valve body means the valve can be installed directly in the main pipeline.

If the inlet pressure rises above the set value, the pressurized valve piston is lifted against the spring force. Consequently, the valve opens and there is a reduction of pressure in the outlet pipe. The valve closes as soon as the inlet pressure sinks below the pre-set spring tension.

Fields of Application:

• microelectronics
• measurement & control
• chemical process industry
• water treatment

Advantages:

• compact design
• good control characteristics
• control unit is hermetically separated from flow medium by standard EPDM or EPDM-PTFE coated diaphragms
• zero static lower body V185
• valve mounting with threaded insert on the lower body V185