Fisher 128-PQC Instruction Manual page 2

128-PQC
Available Configurations
Type 128 Actuator: Yokeless, on-off spring-and-di-
aphragm actuator with action field-reversible be-
tween
spring-open and
spring-close
Design PQC Valve: See table 2
Valve Sizes and End Connection Styles
See table 2
Maximum Inlet Pressures and Temperatures
3600 psig from –20 to 100 F, 3550 psig at 150 F,
and 3520 psig at 180 F (248 bar from –29 to 38 C,
245 bar at 66 C, and 243 bar at 82 C)
Maximum Pressure Drops
See table 3
Actuator Input Signal
0 or 20 psig (0 or 1.4 bar) or
0 or 35 psig (0 or 2.4 bar)
Maximum Actuator Casing Pressure
100 psig (6.9 bar)
Shutoff Classifications
Metal Seats: ANSI Class IV ANSI/FCI 70-2
Soft Seats: ANSI Class VI ANSI/FCI 70-2
1. The pressure and temperature limitations in this manual, and any applicable code limitation, should not be exceeded.
2
Table 1. Specifications
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(1)
Table 2. End Connections and Port Diameters
DESIGN
VALVE STYLE
END CONNECTIONS
SEATING
Inch
PORT PORT
DIAMETERS
mm
C AT MAX TRAVEL
v
FOR LARGEST PORT
WITH FLOW TENDING
TO CLOSE VALVE
1. Cageless construction with seat cut into valve body for soft seat only.
Material Temperature Capabilities
Metal Seat: –20 to 180 F (–29 to 82 C)
Soft Seat: –20 to 150 F (–29 to 66 C)
LCC Valve Body: –50 to 180 F (–46 to 82 C)
Flow Characteristic
Quick-opening with 45-degree taper valve plug
Flow Direction
Either way
Port Diameters
See table 2
Maximum Travel
3/8-inch (10 mm)
Actuator Diaphragm Effective Area
2
33 inches (213 cm
Actuator Pressure Connections
1/4 inch NPT female
Valve Travel Indication
Scale divisions for each 25% of travel are provided
on plastic travel indicator cover
Approximate Weight
17 lb (7.7 kg)
PQC
Combination globe and angle valve body;
common end and bottom connections and
pipe plug allow conversion between globe
and angle styles
1 inch NPT female
Metal Soft
1/4, 3/8, 1/2 1/4, 3/8, 1/2, 3/4
6.4, 9.5, 12.7 6.4, 9.5, 12.7, 19.1
8.32 (angle-style valve body)
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2
)
(1)
(1)