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Types 644 and 645
CONNECT TO BOILER
PRESSURE
A
F
STEAM
SUPPLY
E
D
SUCTION
14A2729-A
A1762 / IL
Figure 3. Typical Installation for a Direct-Acting Governor
WARNING
These actuators must be installed, oper-
ated, and maintained in accordance with
Fisher Controls instructions and all ap-
plicable federal, state, and local codes,
laws, rules and regulations.
If a leak develops in the system or if any
of the equipment is damaged, service is
required. Failure to investigate prob-
lems immediately may cause a hazard-
ous condition.
Call a serviceman in case of trouble.
Only a qualified person must install or
service the actuator.
Installation
WARNING
To avoid personal injury or property
damage caused by bursting of pressure-
retaining parts, be certain the service
conditions do not exceed the casing
pressure limit (maximum
diaphragm) of 200 psi (13.8 bar). Use
pressure-limiting or pressure-relieving
devices to prevent service conditions
from exceeding this limit.
2
B
FISHER TYPE 645-ED
PUMP GOVERNOR
C
PUMP
DISCHARGE
P across the
PUMP
DISCHARGE
SUCTION
14A2789-A
A1763 / IL
Figure 4. Typical Installation for a Relief Governor
The installation site should be protected against dam-
age by external sources such as vehicles. Normal op-
erating temperature range for the Type 644 actuator is
from –40 to 180 F (–40 to 82 C). For the Type 645
actuator, the range is from –35 to 180 F (–37 to 82
C).
Direct Acting Actuators
Proceed as follows to install Type 644 and 645 actua-
tors that are used with push-down-to-close valves
(Type 644-ED, Type 645-ED). Refer to figure 3.
1. Place the governor in the steam line between a
hand operated throttle valve (C) and the steam inlet to
the pump. The governor may be installed in any posi-
tion, as long as the flow is in the direction of the arrow
cast on the valve body. However, when used for
steam service, the unit should be installed so conden-
sate will drain back into the diaphragm casing and
maintain a water seal on the diaphragm.
2. Install a hand-operated throttle valve (E) between
the governor and the steam supply line.
3. Run a 1/4-inch control line from the upper dia-
phragm casing to the side or top of the pump dis-
charge line. Keep the control line away from any nip-
ple, swage, or elbow.
4. Install a lock-shield needle valve (B) and a pres-
sure gauge in this control line.
5. Run a second 1/4-inch control line from the lower
diaphragm casing to the boiler steam pressure line.
Install a needle valve (A) in this line. Slope the line
toward the governor in order to form a water seal on
the diaphragm.
6. Connect the two control lines with an equalizing
line in which a needle valve (F) has been installed.
EQUALIZING
VALVE
BOILER
PRESSURE
RELIEF
GOVERNOR
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