F70U SERIES
UNLOADER VALVE
INSTALLATION,
OPERATION, & MAINTENANCE MANUAL
Revision:
E
Date of Issue:
Jan. 31, 2022
Approved by:
jwo
GG
Engineering Projects Dir.
Sr. Design Eng.
Страница 1: ...F70U SERIES UNLOADER VALVE INSTALLATION OPERATION MAINTENANCE MANUAL Revision E Date of Issue Jan 31 2022 Approved by jwo GG Engineering Projects Dir Sr Design Eng...
Страница 2: ...4 2 2 Service Envelope 5 2 3 Installation 5 2 4 Startup 6 3 0 Main Valve Maintenance 3 1 Disassembly of the F70U Series Main Valve 6 3 2 Reassembly of the F70U Series Main Valve 9 4 0 Testing of the M...
Страница 3: ...valve at least once a year is considered to be good practice to verify operation 3 When a new valve leaves FLOW SAFE it has been manufactured and tested by trained and experienced personnel When you...
Страница 4: ...orce on the seat to keep it closed Control valves in the dome tubing usually include an automatic electric or pneumatic valve to exhaust dome pressure and thus open the main valve and a manual valve t...
Страница 5: ...l valves filters etc for the fastest main valve opening times If a filter is used it should be installed in the dome tube between the main valve inlet and solenoid or tee fitting at the cap A 3 way so...
Страница 6: ...ctly against a machined bore within the body casting 4 Carefully remove the piston assembly Newer pistons may have an interior threaded hole into which a cap bolt can be inserted to use for lifting No...
Страница 7: ...age 7 of 12 F70U SERIES MAIN VALVE 1 5x2 ASSEMBLY ILLUSTRATION BOLT LOCKWASHER CAP GASKET LINER NEWER MODELS ONLY NOT REMOVABLE PISTON SEAT WEAR RINGS SLYDRINGS BODY PICKUP TUBE RETAINER RETAINER SCRE...
Страница 8: ...N VALVE 2x3 AND LARGER ASSEMBLY ILLUSTRATION BOLT LOCKWASHER CAP LINER SEAL S LOWER SEAL ON 4X6 LARGER ONLY LINER PISTON SEAT WEAR RINGS SLYDRINGS BODY PICKUP TUBE RETAINER RETAINER SCREW BOLT LOCKING...
Страница 9: ...size screw size Torque 1 1 2x2 2x3 3x4 1 4 20UNC 80 90 in lbs 4x6 6x8 8x10 1 2 20UNF 30 35 ft lbs 12x16 3 8 24UNF 12 15 ft lbs IMPORTANT Retainer screw must meet firm resistance against locking Heli C...
Страница 10: ...install a blind flange on the valve outlet Again pressurize the inlet up to 5 psig The piston should fully lift and hit the bottom of the cap as indicated by sound or a rod placed through the dome fe...
Страница 11: ...damaged replace with new part s if contaminated clean and reinstall The main valve does not close Dome tube pickup tube or filter damaged or plugged Clean unplug or replace if damaged Pickup tube is...
Страница 12: ...ons on Pages 7 8 Qty Seat 1 Wear ring 2 Liner seal 2 x 3 3 x 4 1 4 x 6 and up 2 Gasket 1 1 2 x 2 only 1 Piston seal 1 Teflon with stainless steel spring except 12x16 7 2 INTERNALS KITS Applicable to m...
