N100, N100A, N110, and N120 Series
5
3. Unscrew the nut (key 6) and remove the
diaphragm head (key 5). Replace the diaphragm
(key 4) and reassemble. Reassemble with loctite
on the valve plug (key 3) threads.
4. To replace the O-ring seal (key 17), remove the
screw (key 19) and the O-ring washer (key 18).
Reinstall the screw (key 19) and O-ring washer
(key 18). Place a small amount of Loctite on the
screw (key 19) before reassembly and tighten.
5. Replace the valve guide orifice (key 2) if the seat
is badly damaged or O-ring (key 16) is leaking.
A special tool is required to replace the valve
guide orifice (key 2). Replace the O-ring (key 16)
and reassemble the valve guide orifice (key 2) by
firmly seating into the body (key 1).
6. O-ring (key 10) can be replaced by removing the
seal cap (key 12).
7. After reassembly, pressure test for leakage and
readjust the setpoint.
Parts Ordering
When corresponding with your local Distributor about
this equipment, include the type number and all other
pertinent information printed on the label. Specify
the eleven-character part number when ordering new
parts from the following parts list.
Parts List
Types N100 and N100A Bypass Valve
(Figure 4)
Key Description
Part Number
1
Body, Ductile iron
NPS 1
2P384419232
NPS 1-1/4
2P383219172
NPS 1-1/2
2P382719232
NPS 2
3R195119232
NPS 2-1/2
3R195219232
2
Spring Case, Ductile iron
Types N100 and N100A (NPS 1 thru 1-1/2)
1P382819172
Type N100 (NPS 2 and 2-1/2)
2R195419272
3
Closing Cap, Aluminum
Types N100 and N100A (NPS 1 thru 1-1/2)
1P382947062
Type N100 (NPS 2 and 2-1/2)
1P360809022
Figure 4.
Types N100 and N100A Bypass Valve Assembly
BP3845
INSTALL OPENING
IN POSITION SHOWN (GREASE
MUST NOT FILL HOLE)
DC - USE DOW CORNING NO. 3 GREASE
AS - USE ANTI-SEIZE ON THREADS
DC
3
12
2
4
13
4
14
16
1
7
AS
4
19
6
DC
11
15
8
