EMERSON Manuals Series 400 Piston Pilot POPRV, Anderson Greenwood-EN

ANDERSON GREENWOOD SERIES 400 PISTON PILOT POPRV INSTALLATION AND MAINTENANCE INSTRUCTIONS

Before installation, these instructions must be carefully read and understood.

As capacity relief of the system is satisfied, 1.3 Start-up system pressure will begin to decrease. When There must be pressure at the valve inlet or at it does, the pilot will actuate and direct system the pilot inlet/sense port for valves with remote pressure to the main valve dome. This closes sense to establish a differential force across the main valve. the piston and ‘load’ it in the closed position.

Pressure must pass through the pilot and exert The pilot is the non-flowing type. With the main force on the top of the piston. On normal plant valve open and relieving at steady pressure, start-up the valve will close itself as pressure no process gas or fluid flows through the pilot. increases.

When process pressure changes, the pilot

actuates to change the lift of the main valve Block valves are often used under safety valves piston. During these actuations a small amount to isolate them when maintenance is required. of gas or fluid from the main valve dome flows When putting the safety valve in service be sure through the pilot and is discharged thru the the block valve is fully opened. If the block valve pilot exhaust. is opened after system start-up, the safety valve may briefly vent before the dome gets The set pressure range is 100 psig to 1480 psig. pressurized to close the main valve seat.

1.2 Installation Either or both inlet and outlet may be standard ANSI flanges or ANSI pipe threaded connections and are to be installed in TABLE OF CONTENTS accordance with accepted piping practices. When remote pressure pick-up is used the pilot 1. General valve description and start-up ...... supply tube is connected to a remote location 2. Main valve maintenance .............................. rather than to the inlet neck of the valve. 3. Pilot maintenance ........................................ A block valve in the remote pilot supply line is 4. Pilot set pressure adjustment .................. not recommended. If one is used it must be 5. Valve assembly testing .............................. opened before pressurizing the main valve.

6. Pilot set pressure field test procedure ....

7. Soft goods repair kits................................. For valves supplied with eyebolts, follow 8. Pilot accessories ........................................ the instructions in Anderson Greenwood 9. Assembly and maintenance equipment ... Pilot operated safety relief valves 05-9040-352 (VCOSI-06034 Operating and 1 GENERAL VALVE DESCRIPTION AND Safety Instructions) pertaining to the safe use START-UP and storage of eyebolts.

1.1 General Refer to Anderson Greenwood Pilot operated The Anderson Greenwood Series 400 valve is safety relief valves 05-9040-372 (VCIOM-03099 designed for modulating action. The main valve Winterization Guidelines) and 05-9040-352 will open at nameplate set, but only an amount for more information regarding Winterization proportional to the relieving capacity required. requirements.

As process pressure increases, the valve will open more and be in full lift at 110% of set. NOTE The main valve uses the principle of Remote pressure pick-up piping must have the pressurizing the top or large area of a equivalent flow area of ⅜” tubing for lengths up to differential area piston with line pressure 100 feet. For lengths greater than this, consult factory. to hold the piston closed up to set pressure. At set pressure, the pilot relieves, depressurizing the volume above the piston, the main valve dome, and the piston lifts permitting discharge from the main valve.

Doc. #05.9040.270 Rev. LA

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