Page 1 of 6 (Section 1 of 2)
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Installation & Maintenance Instructions
Form No.V8714-Sec. 1
HYDRAMOTOR PUSH-TYPE LINEAR ACTUATOR
AH2D
SERIES
(Section 1 of 2)
WITH WATERTIGHT ENCLOSURE
WARNING
To prevent the possibility of death, serious injury or
property damage, the Hydramotor Actuator must be
installed and serviced only by a qualified service
technician avoiding the following hazards:
S Electrical hazard. Turn off all electrical power to
Hydramotor Actuator. More than one circuit may
exist.
S Pressure hazard. Depressurize valve and vent
hazardous or combustible fluid to a safe area before
inspection or removing the actuator or valve from
service.
S Explosion,Ă fire or toxic Ăgas Ăhazards. Extinguish all
open flames and avoid any type of sparking or
ignition during leakage testing.
Service Notices
These instructions are divided into two sections. Be sure to
read, ĂĂunderstand ĂĂĂand ĂĂfollow ĂĂallĂ Ăinstructions onĂ
Form No. V8714 - Section 1 and 2.
See separate V710 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.
DESCRIPTION
AH2D Hydramotors are self-contained linear, push-type
actuators which extend when powered and retract by spring
force upon power interruption.
The AH actuator is typically used for control of gas-fired
heating equipment, commonly to open and close a valve or
both a valve and damper. AH2D actuators position V710
Series gas valve assemblies.
OPERATION
Application of electrical power simultaneously drives an
electric pump and closes a normally-open dump valve,
resulting in up to 250 pounds 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, 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 All components to mount damper
arm on right side of actuator. Available with or without
return spring.
Auxiliary Switch
One or two integral SPDT switches,
field adjustable to actuate at any position of stroke.
Overtravel Proof-of-Closure Switch A single factory set
non-field adjustable SPDT switch to be used in conjunction
with V710 Series Gas Valves with overtravel seal (V22 or
V25 suffix in catalog number).
Figure 1. AH2D Actuator (shown mounted
on V710 Series Gas Valve)
Figure 2. Cutaway View (de-energized)
Cover
screw
Conduit
knockout
(4)
Nameplate/
electrical
cover
Damper arm
(optional)
AH2D actuator assembly
Downstream
pressure tap
Upstream
pressure tap
Oil fill plug
Reservoir
Hydraulic
fluid level
Mounting
gasket
Mounting set
screw (4)
Travel limit
switch
Piston
Actuator stem
Internal
spring
Valve
assembly
Valve stem
position
indicator
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