Zurn Wilkins 4-ZW209 4" Pressure Reducing Valve, Pilot Controlled, Lead-Free, Flanged Connection.
Engineering Specification:
The Pressure Reducing Valve shall be a diaphragm actuated, pilot controlled valve. The main valve body shall be ductile iron ASTM A 536. The stem of the basic valve shall be guided top and bottom. The diaphragm shall not be used as a seating surface. All internal and external ferrous surfaces shall be coated with a high quality, fusion epoxy coating. The pilot control shall be field adjustable from 15 psi to 150 psi. The valve shall be certified to NSF/ANSI Standard 372. The Pressure Reducing Valve shall be a ZURN WILKINS Model ZW209.
Features & Benefits:
| Holds downstream pressure to a constant value | Perfect when high flow rates are needed |
| Applicable to commercial, industrial, and irrigation |
Application:
The Zurn Wilkins Model ZW209 Pilot Operated Pressure Reducing Valve is designed for many applications where the reduction of high inlet pressures to safe and stable outlet pressure is required. 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 Model ZW209 comes standard with epoxy coating internally and externally for corrosion protection, as well as isolation valves and pressures gauges for quick and easy maintenance or repair.
Standard Compliance:
- Certified to NSF/ANSI 372* by IAPMO R&T
- ANSI/AWWA C530
- NSF® Listed-Standard 61 & 372* *(0.25% MAX. WEIGHTED AVERAGE LEAD CONTENT)
Materials:
- Main Valve Body: Ductile Iron ASTM A536
- Main Valve Bonnet: Ductile Iron ASTM A536
- Disc Guide: Stainless Steel
- Seat: Stainless Steel
- Disc: Buna-N
- Rubber Diaphragm: Nylon Reinforced Buna-N
- Stem: Stainless Steel
- Spring: Stainless Steel
*The closing speed control (optional) on this valve should always be open at least three (3) turns off its seat.
Operation:
The Model ZW209 utilizes a pressure reducing pilot valve that installs on the discharge side of the control circuitry. The pilot is a direct acting, normally open, spring loaded, diaphragm actuated valve. The operation of the ZW209 begins with accurately sizing the valve, then fine tuning the control circuit by adjusting the pilot spring to the desired downstream pressure. Inlet pressure is piped to the inlet port of the pressure reducing pilot. A sensing line runs internally from the discharge side of the pilot to its lower control chamber under the diaphragm. Thus, downstream pressure exceeding the preset acts to close the pilot while the adjustable spring seeks to keep it open. The result is a modulating action in the pilot that is transmitted to the bonnet of the main valve. This creates a mirror modulation of the diaphragm assembly in the main valve. Downstream pressure is maintained within narrow limits regardless of changing flow rates or varying inlet pressures.
Technical Documentation:
Media:
Zurn Wilkins 4-ZW209 4" Pressure Reducing Valve, Pilot Controlled, Lead-Free Overview Video:
Zurn Wilkins 4-ZW209 4" Pressure Reducing Valve, Pilot Controlled, Lead-Free Video:
Zurn Wilkins 4-ZW209 4" Pressure Reducing Valve, Pilot Controlled, Lead-Free Features & Benefits Video:
Zurn Wilkins 4-ZW209 4" Pressure Reducing Valve, Pilot Controlled, Lead-Free; Commissioning a ZW209 Pressure Reducing ACV, Video:
Zurn Wilkins 4-ZW209 4" Pressure Reducing Valve, Pilot Controlled, Lead-Free Animation Video:
Zurn Wilkins 4-ZW209 4" Pressure Reducing Valve, Pilot Controlled, Lead-Free Troubleshooting Video:
Zurn Wilkins 4-ZW209 4" Pressure Reducing Valve, Pilot Controlled, Lead-Free, All Stainless Steel Pilotry "SP" Option, Video:
Zurn Wilkins 4-ZW209 4" Pressure Reducing Valve, Pilot Controlled, Lead-Free, All Stainless Steel Braided Hose "SH" Option, Video:
Zurn Wilkins 4-ZW209 4" Pressure Reducing Valve, Pilot Controlled, Lead-Free PRXL Pilot Video:
Zurn Wilkins 4-ZW209 4" Pressure Reducing Valve, Pilot Controlled, Lead-Free Reduced Port Bodies, Video:
Zurn Wilkins 4-ZW209 4" Pressure Reducing Valve, Pilot Controlled, Lead-Free, Angle Bodies, Video:
Cross Reference:
Zurn Wilkins 4-ZW209 4" Pressure Reducing Valve, Pilot Controlled, Lead-Free, Crosses:
- Ames 910GD
- Bailey 400
- Bermad 720
- Cla-Val 90-01
- Golden Anderson 4500-D
- OCV 127-3
- Ross 23/40WR
- Singer 106-PR
- Watts 115
Repair Parts:
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