ITEM NO PART NO. DESCRIPTION
Adjusting Spring
Diaphragm
Diaphragm Gasket
Diaphragm Button & Stem
Assembly
Strainer
Bottom Plug Gasket
Bottom Spring
Seat
Disc Assembly
3/4" Complete Valve-Painted
3/4" Complete Valve-Chrome
Bottom Plug
Valve Stem Guide
WATTS PRESSURE REDUCING VALVES-3/4"
To provide adequate steam pressure regulation, your unit may
be equipped with a Watts steam pressure reducing valve. The
34" Watts pressure reducing valve is designed to operate from a
7 to 50 P.S.I. source of steam pressure and reduce this to 5
P.S.I. for delivery to your cooker. Installation must be made from
your source of steam supply, through the pres sure reducing
valve, and into the manifold input part of the steam cooker.
WARNING: Before final connection is made, blow down
your steam line to remove all dirt, scale, packing and
compound which may have accumulated during the
installation of piping to the cooker.
OPERATION OF WATTS 3/4" REDUCING VALVE
Steam enters the valve at the inlet port and passes upward
through the seat (8) into the discharge side of the valve. As
pressure in the discharge s ide increases, it forces the
diaphragm (2) upward, overcoming the tension of the adjusting
spring (1) and closing valve. As the pressure drops, the
adjusting spring forces the diaphragm down, reopening
the valve. Where demand and initial pressures are fa irly
constant, the valve opens to the proper position and
maintains the desired reduced pressure.
ADJUSTING WATTS 3/4" REDUCING VALVE
1. Release the adjusting screw lock nut and loosen the
adjusting screw enough to release all tension on
adjusting spring (1).
2. Turn steam on slowly. Then turn adjusting screw
clockwise just enough to allow the valve to open
slightly. Allow cooker to operate in this manner several
minutes.
3. Turn adjusting screw down slowly, at intervals, until
reduced pressure reaches th e desired point. (5 P.S.I.)
4. Tighten adjusting screw lock nut.
5. If chattering noise should occur turn adjusting screw
located in bottom half of valve body, clockwise or
counter-clockwise, until chattering stops.
INSPECTION - MAINTENANCE
Reports of uns atisfactory regulation of the pressure
reducing valve is usually due to dirt, pipe compound, etc.,
blocking the internal strainer, or gumming up the seat and
disc assembly. To clean the strainer, seat, and disc
assembly remove the bottom plug (6) and remove strainer
screen (5), bottom spring (7) and disc assy. (9) Clean the
lower part of the valve. This can be accomplished without
removing the valve from the line or unbolting the cover. If
cleaning the strainer and disc assy. does not correct fault,
the dis c assy. and seat should be replaced Also the top
cover should be removed and the diaphragm button stem
assembly should be removed, cleaned and re-installed.
REPAIRS
The following item should be cleaned or replaced should
the valve fail to operate properly.
1. Both the disc assembly (9) and strainer (5) are removed
by removing the bottom plug (11) and bottom spring
(7). Upon cleaning or replacing these items, be sure
that the disc assembly (9) is seated properly on the
stem assembly (4) otherwise the stem a ssembly will be
bent restricting its movement and the regulation of
steam through the valve.
2. Should there be a restriction in the diaphragm button
and stem assembly (4) it will cause a drop in steam
flow or large fluctuations in steam pres sure. It is then
necessary to replace diaphragm button and stem
assembly (4), valve stem guide (12) and diaphragm
gasket (3) as well as those items in step 1.
Upon completion of the above and removal of any loose
scale, which may be found in the valve, the valve should
be reassembled: and upon installation, function properly.
13
1
10-1083
2
10-1082
3
10-1075
4
10-1076
5
10-1077
6
10-1078
7
10-1079
8
10-1080
9
10-1081
10
10-1033
10A
10-1034
11
NPN
12
10-0893