Instruction Manual
Valve Setting (Refer to Figure 2)
If the threaded connection between stem coupling
(key 11) and stem (key 14) is disturbed, follow
these steps:
1. Insert stem assembly (A) and hold disc on seat
ring in closed position, as shown in Figure 2.
2. Screw stem coupling (B) on stem until travel
setting T is reached.
3. Remove stem assembly (A) and lock setting by
drilling hole and inserting dowel pin (C).
Dismantling
To change or inspect composition disc or sealing ring:
1. Remove blind flange (key 24).
2. Remove stem nuts (key 22). Keep stem from
turning by inserting screw driver in slot on end
of stem.
3. Disc holder (key 21) drops out. Carefully remove
balance piston (key 18) so as not to damage
sealing ring (key 16) as it is pulled through seat
ring (key 19).
To examine diaphragm or stem:
1. Remove compression from spring by turning
adjusting screw (key 1) counter-clockwise.
2. Remove diaphragm bolts (key 9) and lift off spring
chamber (key 4).
3. Lift pressure plate (key 7) to withdraw diaphragm
and stem from valve.
4. To examine diaphragm, disassemble coupling nut
(key 6) and lift off pressure plate (key 7).
Troubleshooting
Inadequate flow or delivery pressure:
1. Check for clogged control ports connecting body
outlet with diaphragm chamber.
2. Check for deposits causing sticking of
sealing ring (key 16) or stem (key 14) in their
respective guides.
Check initial pressure to see if full intended line
pressure is applied at the valve inlet.
Reduced pressure builds up:
1. Foreign matter may be lodged between disc
(key 20) and seat ring (key 19). Remove blind
flange (key 24) and inspect it.
2. Diaphragm (key 8) may be ruptured. Remove
spring chamber (key 4) and inspect it.
3. Sealing ring (key 16) may be damaged. See
dismantling instructions to replace sealing ring.
Parts Ordering
When corresponding with your local Sales Oce about
this equipment, always reference the equipment valve
size, service and serial number.
When ordering replacement parts, reference the key
number of each needed part as found in the following
parts list and indicate the part number.
Parts List
Key Description Part Number
Spare Parts Kit (included are keys
6, 7, 8, 11, 13, 14, 16, 20, 21, 22 and 23)
NPS 1 / DN 25 WAL33162
NPS 1-1/4 / DN 32 WAL33163
NPS 1-1/2 / DN 40 WAL33164
NPS 2 / DN 50 WAL33165
NPS 2-1/2 / DN 65 WAL33166
NPS 3 / DN 80 WAL33167
NPS 4 / DN 100 WAL33168
NPS 5 / DN 125 WAL33169
NPS 6 / DN 150 WAL33170
Type D34 Pressure Reducing Valve See Table 2
5
Type D34