EMERSON Manual Fig. 910 Low Pressure Pilot Operated Relief Valve, Anderson Greenwood-EN

Anderson Greenwood Marvac fig. 910 Low pressure pi Lot operated re Lief va Lve Installat Ion and Ma Intenance Instruct Ions

Before installation these instructions must be read fully and understood

1 Inst All At Ion 3. remove the complete piston / pressure pallet assembly, taking care not to damage refer to Figures 1 and 2 the dome seal (item 15) on the elastomer 1. this equipment will be supplied in a packing diaphragm. the ptfe seal tape on the pfa case and should be kept in the case for diaphragm will need replacing and the protection until the engineer is ready to spinning will need cleaning. install it. 4. check the pilot diaphragm (item 11) and the 2. prior to installation the engineer should pfa diaphragm under the pressure pallet check that the equipment is not damaged, for damage. replace as necessary. particularly the total pressure sensing tube 5. release the bolts from the pressure seat (item 17). (item 20) and remove the seat. replace the 3. visually check inside the casting via the expanded ptfe seal (item 19). outlet port and remove any packing or 6. clean the inside of the casting, removing foreign matter if present. any dust or grit. 4. when lifting the equipment care should 7. if necessary, replace pressure seat with new be taken not to damage the stainless steel seal. tubing (item 17), the protruding studs and 8. clean the seating surfaces thoroughly with a the actual pilot valve itself (item 16). suitable solvent. 5. sizes 2” x 3”, 3” x 4” and 4” x 6” can be lifted 9. if installed, remove the casing from the manually or by slings. care should be taken non-return valves, check the 2 x o-rings and not to hold the stainless steel tubing and replace if necessary. actual pilot valve whilst lifting. all other sizes 10. re-assemble the unit in reverse order. have three tapped bosses for lifting bolts. 11. if damaged or scratched, the exterior of 6. the valve inlet should be gasketed and the valve should be painted to prevent bolted to a flat machined horizontal flange. corrosion. 7. the valve outlet should be gasketed and 12. the efficiency of the valve depends on bolted to a flat machined vertical flange. maintaining good seating surfaces and on the condition of the main valve diaphragm. note Maintenance periods should be adjusted to on no account should the exhaust pipework be suit service conditions.

supported by the valve. these valves are not designed to carry external loads.

2 MAIn VAl Ve MAInten An Ce

refer to Figures 1 and 2 1. remove pilot valve (item 16) by releasing the upper nut (item 25) and unscrew pilot valve from dome spinning (item 10) 2. release the cover screws (item 2) from the dome spinning (item 10) and remove the dome spinning without damaging the pilot diaphragm (item 11). Mark dome spinning before reassembly to ensure correct hole alignment on reassembly.

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