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Main> Equipment> Deluge and Pressure Control Valves> Pressure Reducing Valve PC9-FP 730-48-BL

Pressure Reducing Valve PC9-FP 730-48-BL

Features and Benefits

Safety Features

❑ Provides soft pump start for system surge protection

❑ Pre-opening to anticipate and pre-empt start-up surge

and expel initial air build up.

❑ Double chambered for reliable quick and smooth

opening/closing

❑ Unobstructed flow path with no lower guide/ribs

High Performance

❑ Y-shape straight-through-flow or angle body design

❑ High flow capacity

❑ 25 bar / 365 psi Rated

Maintenance

❑ In-line serviceable

❑ Cover and actuator removal without removing the

control trim

The BERMAD PC9-FP-730-48-BL is a Normally Open, Anti Surge, pilot-operated and diaphragm-actuated control valve. It has a double-chambered actuator for positive and reliable actuation with an external lift spring, giving the valve it’s normally open characteristic. This affords the BERMAD PC9-FP-730-48-BL a zero reaction time, pre-empting and dissipating any pressure surge or excess air at pump start up. Once the surge has passed and system piping pressure has normalized the PC9-FP-730-48-BL will close and will continue duty as a relief valve, relieving pressure spikes when needed, keeping the system pressure at its designed level. The PC9-FP-730-48-BL is an autonomous valve operating under line pressure alone requiring no external power source.

Standby: The PC9-FP-730-48-BL is a Normally Open valve with an external lifting spring [1] keeping the valve in a fully open position as default when the system piping is depressurized, as might be before a pump start-up. When thepump starts the initial pressure surge and excess air will be expelled from the system through the valve.

Relief / Modulating: After the surge has passed, air has been exhausted and the system piping reaches normal pressure, the BERMAD PC9-FP-730-48-BL will continue duty as a pressure relief / sustaining valve, controlled by the pressure relief pilot valve [2] which should be pre-adjusted to the required pressure. When the system pressure is above the set pressure, the pilot valve will open, enabling water to exit the main valve control chamber [3] allowing the main valve to open and relieve system over-pressure.

Closed: When the system pressure falls below the set pressure the pilot valve will close allowing inlet pressure to accumulate in the main valve control chamber, closing the main valve. The closing speed can be set by changing theneedle valve [4] adjustment. The valve will remain closed and will open only when either the piping system pressure exceeds the required set pressure or when there is no pressure in the piping system.

Typical Installations

A typical installation of the Model: BERMAD PC9-FP-730-48-BL is in systems where a pump start up would be followed by a pressure surge or contain accumulated residual air that has to be prevented from entering the piping system for the proper and safe function of a fire protection system. When fitted close to the pump outlet the Normally Open characteristic of the PC9-FP-730-48-BL means a zero reaction time to initial pressure spikes and a maximum amount of the air being exhausted immediately before entering the system piping. The high flow capacity of the valve enables an efficient and fast surge prevention and air extraction procedure. When the pipeline pressure normalizes to below the relief set pressure, determined by the adjustable pilot valve, the BERMAD PC9-FP-730-48-BL will tend to close. Closing of the valve is positive and fast due to the double chamber, yet cushioned and smooth, due to the hydraulic characteristic of under-the-seat flow direction. Whilst there is pressure in the pipeline the valve will continue service as a normal pressure relief or sustaining valve. As soon as the pump is shut down and the pipeline is depressurized, the BERMAD PC9-FP-730-48-BL will return to the Normally Open position in standby and ready to dispel air contamination on the next pump start-up.

The BERMAD PC9-FP-730-48-BL installed downstream of a deep well pump

The BERMAD PC9-FP-730-48-BL installed downstream of a centrifugal pump

Suggested Specifications

The valve body shall be a center guided, diaphragm actuated globe valve, with a Y-type straight-through-flow or angle pattern design. The flow passage shall be unobstructed and free of any supporting ribs. The valve shall have a removable non-corrosive stainless steel seat ring with no stem guide, an anti-surge external lift spring and a field adjustable pilot with an integral main valve closing speed adjustment capability. The valve shall be Normally Open (N.O.). Valve actuation shall be accomplished by a vented double chambered actuator with a stainless steel stem and seat housing, creating a drip tight seal. Servicing the valve for inspection or maintenance shall be inline and shall not require removal of the valve from the pipeline. The valve shall be rated for 25-bar/365-psi. The valve and its entire control trim shall be supplied pre-assembled and hydraulically tested by a factory certified to ISO 9000 and 9001 standards.