ASCO Valves
®
E314794 - 08/2021
All Rights
Reserved.
I&M V_9953_AC
©
ASCO, L.P. 160 Park Avenue, Florham Park,
New Jersey 07932
www.emerson.com
Page 1 of 4
I&M V_9953_AC
Installation & Maintenance Instructions
PUSH-TYPE LINEAR ACTUATOR
WITH ON/OFF OR HIGH/LOW/OFF OPERATION
WITH GENERAL PURPOSE OR WATERTIGHT ENCLOSURE
WARNING
To prevent the possibility of death, serious injury or
property damage, the actuator must be installed and
serviced only by a qualified service technician avoiding the
following hazards:
•
Electrical hazard: Turn off all electrical power to actuator.
•
Risk of electric shock: More than one disconnect switch
may be required to de-energize the device for servicing.
•
Pressure hazard: Depressurize valve and vent hazardous
or combustible fluid to a safe area before inspection or
removal of the actuator or valve from service.
•
Explosion, fire or toxic gas hazards: Extinguish all open
flames and avoid any type of sparking or ignition during
leakage testing.
AVERTISSEMENT
Afin de prévenir le risque de décès, de graves blessures
ou de dommage matériel, l’actionneur doit être installé et
entretenu exclusivement par un technicien de maintenance
qualifié, en évitant les dangers suivants:
•
Danger électrique: Coupez toutes les sources
d’alimentation électrique de l’actionneur.
•
Risque d’électrocution: Plus d’un interrupteurs de
coupure peuvent s’avérer nécessaires pour mettre
l’appareil hors tension pour les opérations de
maintenance et de réparation.
•
Danger lié à la pression: Dépressurisez la vanne et
évacuez le fluide dangereux ou combustible vers une
zone sécurisée avant d’inspecter ou de retirer la vanne
du service.
•
Risques d’explosion, d’incendie et de gaz toxiques:
Éteindre toutes les flammes nues et éviter tout type
d’étincelle ou d’ignition pendant les essais de détection
de fuite.
Service Notices
See separate _158A Series Gas Valve or V710_B Gas Valve Installation
and Maintenance Instructions for information on: Operation, Positioning,
Mounting, Piping, Strainer or Filter Requirements, Flow Controls,
Preventive Maintenance and Cause of Improper Operation.
Do not install the P159A Series Actuator with general purpose enclosure
(Type 1) in a location subject to weather, wash down or other sources
for water ingress. Use Type 4 version of the actuator with watertight
enclosure for these locations.
DESCRIPTION
The P159A Series Hydraulic Actuator is a self-contained linear, push-type
actuator which extends when powered and retracts by spring force upon power
interruption.
The P159A Series Actuator is typically used for control of gas-fired heating
equipment, commonly to open and close a valve or both a valve and damper.
The P159A Series Actuator positions _158A Series Gas Valves or V710_B
Series Gas Valves.
OPERATION
P159A1 - ON/OFF ACTUATOR
Application of electrical power simultaneously drives an electric pump and
closes a normally-open dump valve, resulting in up to 1100 N (250 lbf) of
force on the actuator stem. This extends the actuator stem and attached valve
poppet, to open the valve and/or damper.
Upon reaching the fully extended position, a travel limit switch interrupts
power to the electric motor while maintaining power to the dump valve, thus
stabilizing hydraulic pressure to hold shaft position. Position indicators on
both sides of the actuator show the actual position of the valve stem. Upon
power interruption, the dump valve opens, releasing hydraulic pressure and
allowing the return spring to retract the stem and close the valve fully. Closing
time is one second or less.
SERIES
P159A
P159A2 - HIGH/LOW/OFF ACTUATOR
Application of electrical power simultaneously drives an electric pump and
closes a normally-open dump valve and control valve, resulting in up to 1100
N (250 lbf) of force on the actuator stem. This extends the actuator stem and
attached valve poppet, to open the valve and/or damper.
Upon reaching the low fire set point, a low fire switch interrupts power to
the motor while maintaining power to the dump and control valves, thus
stabilizing hydraulic pressure to hold shaft position.
Closing the external high fire switch causes the actuator to extend beyond the
low fire point.
Upon reaching the fully extended position, a travel limit switch interrupts
power to the electric motor while maintaining power to the dump valve and
control valves, thus stabilizing hydraulic pressure to hold shaft position.
Opening the high fire switch de-energizes the control valve allowing the gas
valve to return smoothly to the low fire position.
Position indicators on both sides of the actuator show the actual position of
the valve stem.
Upon power interruption, the dump valve opens, releasing hydraulic pressure
and allowing the return spring to retract the stem and close the valve fully.
Closing time is one second or less.
OPTIONAL FEATURES
•
Damper Shaft Arm
is factory
-
mounted on right hand side. The arm is
field
-
adjustable to 8 positions and can be switched to the left hand side.
»
Damper Arm Rating:
Drives damper in one direction only. 9 kgf (20
lbf) maximum at 72.4 mm (2.85 in) radius at -7 °C to 66 °C (20 °F to
150 °F) and 4.5 kgf (10 lbf) maximum at -40 °C to -7 °C (-40 °F to 20
°F). Damper spring and linkage must provide sufficient return force.
»
Damper Arm Travel:
48 mm (1.9 in)
•
Auxiliary Switch
One or Two integral SPDT switches, field adjustable to
actuate at any position of stroke. This is not a safety switch.
•
Proof-of-Closure Switch
A single factory set, non-field adjustable, SPDT
switch to be used in conjunction with _158A Series Gas Valves or V710_B
Series Gas Valves with overtravel seals (See ACTUATOR / VALVE
COMPATIBILITY Table).
NOTE: The High/Low/Off Actuator is not available with actuator catalog
electrical options 4, Auxiliary and Proof-of-Closure Switch or option 5,
Two Auxiliary Switches (See Figure 1).
Figure 1.
P159A Series Product Codification
Connection Type
P = No Connection
159A Series
Function
1 = On/Off Actuator
2 = Hi/Low/Off Actuator
Enclosure/Opening Time
10
= Watertight - Slow Opening (
18
sec)
11
= Watertight - Fast Opening (
9 sec
)
20
= General Purpose - Slow Opening (
18 sec
)
21
= General Purpose - Fast Opening (
9 sec
)
Electrical Connection Type
X1 = ½”: For use with ½” threaded fittings
X2 = M20: For use with M20 type threaded fittings
Mechanical Options
X0 = None
X1 = Damper Shaft With Arm
X2 = Damper Shaft
Electrical Options
1 = None
2 = Auxiliary Switch
3 = Proof-of-Closure Switch
4 = Auxiliary Switch & Proof-of-Closure Switch
5 = Two Auxillary Switches
Voltage
F0 = 120/60, 110/50
CU = 240/60, 230/50
P 159A 1 10 X1 X0 1 F0
(ON/OFF ALUM ACT WT-SLOW AC)
Figure 1. P159A Series Product Codification
Emerson
Classification:
Internal
