Accu-Flo Meter Service RED SEAL MEASUREMENT neptune, Operating And Maintenance

Page: 9 / 20

DOUBLE TRIP
MAINTENANCE
To Disassemble and
Assemble Double Trip
Valve (Type 1A)
Page 7
10. It is sometimes necessary to change the position of set screw (B) if the clevis has been
readjusted. If the register mechanism will not latch up, unscrew the set screw to allow the
valve to open further. If the connection rod (G) is under compression, when the valve is
held all the way open, turn the set screw down to relieve the pressure on the register.
11. The Auto-Stop trip adjusting screw should be near its mid-position. If a small adjustment of
this screw will not permit the register to shut off “on the mark” it is usually possible to correct
this by a slight adjustment of the clevis (F). This will move the main valve nearer to or further
away from its seat during the intermediate flow and thereby change the amount of time
needed for the valve to fully close at the last trip (Also see To Adjust The Tripping Point.)
NOTE: If it is difficult to obtain proper rate of flow during intermediate trip position and still
have regular latch up fully. Check Auto-Stop valve to insure that it is opening all the way.
Check valve by removing set screw (B) and clevis (F) from valve arm; open valve as far as
possible. The distance between lug on arm and lug on stop plate must not be more than
1
⁄
4
″ .
DOUBLE TRIP MAINTENANCE
To Disassemble and Assemble Double Trip Valve
1. Remove valve from flowmeter.
2. Remove two screws (A) holding retaining ring (B) at inlet of valve. (Caution: End plate should
be held by hand when removing screws because of spring tension beneath the plate.) All
internal parts of the valve can now be removed with the exception of the operating shaft
mechanism. The removal of the internal parts from the valve body may be assisted by oper-
ating the valve handle as when operating the valve.
3. Disassemble piston and throttling ring assembly (items F to K). Inspect valve seats, “O” ring
gaskets, piston ring (D), and cylinder (C) for damaged surfaces. Replace all defective parts
with new parts.
4. Reassemble piston and throttling
ring assembly. Apply Loctite Black
Max 380 to bond the disc (G) to
the piston (F), and allow 24 hours
to cure before placing in service.
Apply Loctite Threadlocker 242
under heads of three piston as-
sembly screws (H).
5. Assemble pilot valve (E) on pilot
valve rod (J). Place assembly into
valve body.
6. Place one end of spring over pilot
valve boss.
7. Place other end of spring over boss in cylinder (C) and press cylinder down over piston (F).
Back of cylinders should be below flange face for proper assembly.
8. Hold cylinder in place, place “O” ring in body recess and attach retaining ring (B) with two
screws (A).
9 Open valve as far as possible — make sure that valve is not being stopped by set screw (L).
FIGURE 5
VALVE ASSEMBLY