Series 127 - OCV Pressure Reducing Valve

The OCV Pressure-Reducing Valve is used in many applications worldwide. The primary function of the 127 series is to reduce a greater upstream pressure to a lesser, more manageable downstream pressure, operating without regard to either upstream supply or downstream demand.

Features

• Operates automatically off line pressure.
• Heavy-duty, nylon-reinforced diaphragm.
• Rectangular-shaped, soft seat seal provides drip-tight Class VI closure.
• Diaphragm assembly Guided top and bottom.
• Throttling seat retainer for flow and pressure stability.
• Easily maintained without removal from the line.
• Replaceable seat ring.
• Alignment pins assure proper reassembly after maintenance.
• Valves are factory tested.
• Valves are serial numbered and registered to facilitate replacement parts and factory support.

Regardless of the source of high pressure, the 127-3 reduces that pressure to a constant discharge pressure, despite fluctuations in the demand or inlet pressure. Here, a parallel valve arrangement is used to handle a wide range of demand.
(see Sizing Pressure Reducing Valves)

Valve Operation

• Maintains a constant downstream pressure despite fluctuations in demand and inlet pressure.
• Assuming proper sizing and adjustment, the 127-3 will maintain downstream pressure at the set point ± 2 psi

1. Model 65 Basic Control Valve, a hydraulically-operated, diaphragm-actuated globe or angle valve which closes with an elastomer-on-metal seal.
2. Model 1340 Pressure-Reducing Pilot, a two-way, normally-open pilot valve which senses down stream pressure under its diaphragm and balances it against an adjustable spring load. An increase in downstream pressure tends to make the pilot close.
3. Model 126 Ejector, a simple “tee” fitting with a fixed orifice in its upstream port. It provides the proper pressure to the diaphragm chamber of the main valve, depending on the position of the pressure-reducing pilot.
4. Model 141-3 Flow Control Valve, a needle-type valve which provides adjustable, restricted flow in one direction and free flow in the opposite direction. On the 127-3, the flow control valve is connected as an opening speed control.
5. Model 159 Y-Strainer, (standard on water service valves), the strainer protects the pilot system from solid contaminants in the line fluid.
6. Two Model 141-4 Ball Valves, (standard on water service valves, optional on fuel service valves), useful for isolating the pilot system for maintenance or troubleshooting.

• Model 127-2 - Pressure Reducing and Pressure Sustaining Valve
• Model 127-3 - Pressure Reducing Valve
• Model 127-32 - Pressure Reducing with Two Stage Opening
• Model 127LF/727LF - Pressure Reducing with Low Flow
• Model 127-4 - Pressure Reducing and Check Valve
• Model 127-5 - Pressure Reducing and Surge Control Valve
• Model 127-420 - Pressure Reducing/Sustaining/Check Valve   
• Model 127-80 - Pressure Reducing and Solenoid Shut-Off     
• Model 127FAV - Flow Control and Programmable Solenoid Valve
• Model 129 - Pressure Reducing with 3-Way Pilot