IMO 10/19
10
IMO-215 EN
4.6
Fusible Plug (LK-3116)
The fusible plug melts during a fire or excessive
environmental temperature when the temperature reaches
an approximate level of 165°F. This releases the air from the
diaphragm case and rotates the valve to its fail-safe position.
NOTE: If needed, LK-3192 has a higher melting point of 212°F.
Installation
1. Using thread sealant, attach the fusible plug (3) and
pipe nipple (1) into the street tee as shown in Figure 9.
2. Insert this assembly into the plug guard (4) and secure
using the screw (5), lock washer (6), and hex nut (7).
3. Using thread sealant, attach the completed fusible plug
assembly to the 3/8" NPT port on the QPX diaphragm
casing. The tubing from the solenoid or positioner will
attach to the other end of the pipe nipple.
Fusible plug Exploded View
A
A
5
6
7
SECTION A-A
1
2
3
4
Figure 9.
5.
REPAIR KITS/SPARE PARTS
SERVICE KITS
Model
Complete
Diaphragm
QPX1
RKQ-68
RKQ-75
QPX2
RKQ-70
RKQ-76
QPX3
RKQ-71
RKQ-77
QPX4
RKQ-72
RKQ-78
QPX5
RKQ-73
RKQ-79
For further information on spare parts and service or
assistance visit our web-site at www.metso.com/valves.
ITEM
PART NAME
QTY
1
PIPE NIPPLE
1
2
STREET TEE
1
3
FUSIBLE PLUG
1
4
PLUG GUARD
1
5
FIL. HD SCREW
1
6
LOCKWASHER
1
7
HEX NUT
1
