Emerson Fisher 644, Fisher 645 Installation Instructions
Instruction Manual
D100302X012
644 and 645 Pump Governors
February 2014
Fisherr 644 and 645 Differential Pressure Pump
Governors
Contents
Introduction 1.................................
Scope of Manual 1.............................
Description 1.................................
Specifications 2...............................
Educational Services 3.........................
Installation 3..................................
Direct-Acting Actuators 4.......................
Reverse-Acting Actuators 5.....................
Overpressure 6.................................
Startup 6......................................
Adjustment 6.................................
Principle of Operation 7.........................
Maintenance 7.................................
Disassembly 8................................
Reassembly 8.................................
Parts Ordering 10...............................
Parts List 10...................................
Figure 1. Fisher 644 Actuator Mounted on a Typical
easy-e™ Valve
W2265-1
Introduction
Scope of Manual
This instruction manual provides information on installation, adjustment, maintenance, and parts ordering for the
Fisher 644 and 645 differential pressure pump governors. Refer to separate instruction manuals for information about
the valve and other accessories used with these governors.
Do not install, operate, or maintain 644 or 645 governors without being fully trained and qualified in valve, actuator,
and accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is important
to carefully read, understand, and follow all the contents of this manual, including all safety cautions and warnings. If
you have any questions about these instructions, contact your Emerson Process Management sales office before
proceeding.
Description
644 and 645 actuators are used in combination with any of several sliding-stem valves to automatically control
steam-driven boiler feedwater pumps (reciprocating or turbine). The 644 or 645 actuator (see figures 1 and 2), when
used in combination with one of several push-down-to-close sliding-stem valves, forms a pump governor.
644 and 645 actuators may also be combined with push-down-to-open valves to be used as relief governors. Relief
governors are used to divert excess pump discharge back to the suction side of the pump.
www.Fisher.com
644 and 645 Pump Governors
February 2014
Table 1. Specifications
Instruction Manual
D100302X012
Actuator Sizes
See table 2
Actuator Travel
Chloroprene Diaphragm: 11 mm (0.4375 inch)
maximum
Stainless Steel Diaphragm: 3 mm (0.125 inch)
maximum
Operating Principle
J Direct-acting with push-down-to-close valve
J Reverse-acting with push-down-to-open valve
Differential Pressure Ranges
See table 2
Maximum Casing Pressure
644 Actuator:
Cast-Iron Casing: 20.7 bar (300 psig)
Steel Casing: 41.4 bar (600 psig)
645 Actuator:
Cast-Iron Casing: 34.5 bar (500 psig)
Steel Casing: 69.0 bar (1000 psig)
Maximum nPAcrossDiaphragm
13.8 bar (200 psi)
Effective Diaphragm Area
644:
Size 1: 146 cm
Size 2: 243 cm
Size 3: 364 cm
645:338cm
2
(8.9 inch2)
2
(14.8 inch2)
2
(22.2 inch2)
2
(20.6 inch2)
Material Temperature Capabilities
644:
Chloroprene Diaphragm:-40 to 82_C
(-40 to 180_F)
Stainless Steel Diaphragm:
Cast-iron casing: -40 to 232_C(-40to450_F); Steel
casing: -40 to +399_C(-40to750_F)
645: -37 to 82_C(-35_ to 180_F)
Casing Pressure Connections
1/4 NPT internal
Spring Ranges and Sensitivity
See table 2
Specifications
Specifications for the 644 and 645 pump governors are shown in table 1. Information for a specific pump governor is
also found on the nameplate of that pump governor.
Table 2. Spring Information
DIFFERENTIAL PRESSURERANGE SPRING RATE SENSITIVITY
Bar Psi N/mm Lbf/in mm/N In/Psi
0.3-1.2
1.2-1.9
1.9-2.8
2.8-3.8
3.8-4.7
4.7-6.9
1.0-1.7
1.7-2.4
2.4-3.2
3.2-4.1
4.1-4.3
4.3-5.9
5.9-6.8
6.8-8.2
8.2-9.7
9.7-10.7
5-18
18-27
27-40
40-55
55-68
68-100
14-24
24-35
35-47
47-59
59-62
62-85
85-99
99-119
119-140
140-155
56
107
107
165
107
165
43
64
86
107
129
145
221
257
310
368
314
609
609
940
609
940
246
368
490
612
735
830
1260
1470
1770
2100
26.1
13.5
9.0
6.2
5.4
3.7
21.0
14.0
10.5
11.0
7.1
6.2
4.1
3.5
2.9
2.5
0.0707
0.0365
0.0244
0.0168
0.0146
0.0101
0.0286
0.0299
0.0191
0.0169
0.0111
0.0095
0.0079
0.0067
0.057
0.038
SPRING PART NUMBER
1F945527032
1F945627032
1F945627032
1F945727042
1F945627032
1F945727042
1F714427112
1F176727032
1F176827092
1F176927092
1E792327092
1F714327092
1E795327082
1E792427082
1E795427082
1E793327082
644
2
ACTUATOR
Size 3
Casing
Size 2
Casing
Size 1
Casing
645
Instruction Manual
D100302X012
644 and 645 Pump Governors
February 2014
Educational Services
For information on available courses for Fisher 644 and 645 pump governors, as well as a variety of other products,
contact:
Emerson Process Management
Educational Services - Registration
P.O. Box 190
Marshalltown, IA 50158-2823
Phone: 800-338-8158 or 641-754-3771
FAX: 641-754-3431
e-mail: education@emerson.com
Figure 2. Typical Pump Governor Sectionals
W2263-1
644 ED
W2264-1
645 ED
WARNING
These governors must be installed, operated, and maintained in accordance with Fisher instructions and all applicable
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 problems
immediately may cause a hazardous condition.
Call a serviceman in case of trouble. Only a qualified person must install or service the actuator.
Installation
WARNING
Always wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal
injury.
3
644 and 645 Pump Governors
February 2014
Instruction Manual
D100302X012
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 nP across the diaphragm) of 13.8 bar (200 psi). Use
pressure-limiting or pressure-relieving devices to prevent service conditions from exceeding this limit.
Check with your process or safety engineer for any other hazards that may be present from exposure to process media.
If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this
instruction manual.
Normal operating temperature range for the 644 actuator is from -40 to 82_C(-40to180_F). For the 645 actuator, the
range is from -37 to 82_C(-35to180_F).
Figure 3. Typical Installation for a Direct-Acting Governor
CONNECT TO BOILER PRESSURE
A
F
B
STEAM
SUPPLY
14A2729-A
A1762
EC
D
645-ED PUMP
ACTUATOR
PUMP
DISCHARGE
SUCTION
Direct-Acting Actuators
Proceed as follows to install 644 and 645 actuators that are used with push-down-to-close valves (644-ED, 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 position, 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 condensate will drain back into the
diaphragm casing and maintain a water seal on the diaphragm. Failure to do so may impact performance.
2. Install a hand-operated throttle valve (E) between the governor and the steam supply line.
3. Runa1/4-inchcontrollinefromtheupperdiaphragmcasingtothesideortopofthepumpdischargeline.Keepthe
controllineawayfromanynipple,swage,orelbow.
4. Install a lock-shield needle valve (B) and a pressure 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 actuator 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.
4
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