Leslie Controls GP Pressure reducing valve - Manual (Page 8)

Page 8
3. Install main valve, main valve spring, bottom cap with
guide bushing and bottom cap gasket. Tighten bottom
cap.
4. Place travel stop washer over upper end of main valve
stem followed by diaphragm disc (GPK-2T and GPK-
2TC, sizes 1” through 2” do not have a travel stop).
5. Check height of disc. IMPORTANT: Height of diaphragm
disc MUST be correct to obtain TIGHT SHUT-OFF of
main valve. See Clearance Table and sketch for details.
If MINIMUM clearance is LESS than that shown in
Clearance Table, remove main valve and grind just
enough metal from end of main valve stem to obtain
proper clearance* (see view) If MAXIMUM clearance is
MORE than that shown in Clearance Table, the rated
travel of main valve will be reduced causing a reduction
in the rated steam capacity of valve. If reduced capacity
is great enough to affect system operation, a new seat
ring and main valve should be installed.
6. GPK-1T Type—Replace the three diaphragms mak- ing
sure the lower two leaves are those having a small bleed
hole. The upper or top diaphragm is solid and does not
have a bleed hole. GPK-2TC and GPK-2T Types —
Replace SUPERFLEX DIAPHRAGM.
7. Loosen bottom cap sufficiently until diaphragm disc
rests against main valve guide or travel stop if one is
used. Place SUPERFLEX diaphragm on top of disc and
center into recess of valve body. Replace diaphragm
cover spacer ring on GPK-2TC only. In-stall diaphragm
cover and tighten nuts evenly and securely. Retighten
bottom cap.
8. If possible check valve for tight seating, using steam
pressure equal to actual operating pressure before
installing valve in line.
9. BEFORE INSTALLING VALVE: Clean strainer at in-let of
valve and blow out piping including impulse pipe.
Check traps for proper operation. Check pressure
gages to make sure they read pressure correctly.
GAGE BLOCK MINIMUM MAXIMUM
VALVE SIZE HEIGHT CLEARANCE CLEARANCE
1 ⁄
2
" - 1 1 ⁄
2
" .187 + .000 .073 to .071 .100
- .022
1 1 ⁄
2
" - 2" .218 + .000 .076 to .074 .103
- .002
2 1 ⁄
2
" - 4" .312 + .000 .024 to .022 .066
- .002
To check disc height, place two gage blocks on flat of diaphragm face opposite each other. Place a straight edge across blocks
and measure clearance between bottom edge of straight edge and top of diaphragm disc as shown in sketch.
CLEARANCE TABLE
Gage Block
Clearance
(See Table)
Straight Edge
Gage
Block
Travel Stop
Dia. Disc
*Grind Off
Main Valve
Stem At
This End