Overview of A Pressure Reducing Valve

Benefits of installing Pressure reducing valves:

Pressure reducing valves (PRVs) are used to lower the municipal water supply pressure feeding commercial buildings and homes. Pressure reducing valves are required by code when the street pressure is higher than 80 psi. In addition to meeting code, there are numerous benefits to installing a PRV in plumbing or irrigation system.

Zurn Flush Valve
  • Water Conservation
    • The average household can reduce water consumption around 33% by adjusting the pressure from 100 psi to 50 psi. That can lower sewer bills, on top of water usage.
  • Energy Conservation
    • Less water is pumped through the distribution system, resulting in lower energy and heating costs for the water purveyor and sewage treatment facility.
  • Extend System Life
    • PRVs help extend the life of pipes, faucets, and appliances by reducing wear on system components caused by excessive pressure. Long-term pressure may lead to breakage, causing flooding and property damage.
  • Irrigation Systems
    • Typical irrigation systems require pressure below 70 psi in order to adequately water landscapes while reducing water waste. PRVs maintain this pressure while preventing premature solenoid valve and sprinkler head failure, water hammer, and nozzle fogging.

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How Pressure Regulator Valve Operates

Zurn Wilkins direct-acting water pressure regulators are normally open and are biased to the open position by a preloaded spring. The valve will remain in the open position until downstream pressure forces the plunger onto the seat, closing the valve. The valve is closed by reduced pressure water pushing on the wetted side of the diaphragm, countering the force of the spring. The amount of reduced pressure is directly proportional to the preloaded spring. When the valve is pressurized, it remains closed until downstream demand is placed on the system. When demand occurs, such as turning on a faucet, the outlet pressure drops and decreases the force on the wetted side of the diaphragm, allowing the spring to bias the valve open to satisfy demand. The valve will continue to modulate in the open position until the demand placed on the system ceases.

When demand ceases, the valve will close. Water pressure regulator valves are capable of holding the static downstream pressure within very narrow limits, because the operating intelligence for pressure regulator is independent of inlet pressure, regardless of inlet pressure fluctuations.

Zurn Wilkins Pressure Reducing Valve Features:

Fire Protection from Zurn

The Zurn Wilkins Model ZW209FP Pilot Operated Pressure Reducing Valve is designed specifically for Fire Suppression Systems to reduce high inlet pressures to a safe and stable outlet pressure. The pilot assembly reacts to changes in downstream pressure allowing the main valve to modulate between the closed and open position ensuring a constant downstream set pressure. Once the downstream pressure reaches the pilot setting, the main valve will seal shut preventing damage downstream. Pressure regulation is not dependent upon flow rate, resulting in minimal pressure loss through the valve. In addition the Models ZW209FP and ZW209FPG come standard with red epoxy coating internally and externally for corrosion protection, as well as isolation valves and pressure gauges for quick and easy maintenance or repair.

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