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SKP15=U Electro-hydraulic Actuators
Technical Instructions
Document Number 155-751
July 9, 2014
Siemens Building Technologies, Inc.
Page 3
Operation
Figure 1. SKP155 Operation.
The electro-hydraulic actuator consists of a cylinder filled with oil, a piston containing an
electric oscillating pump, and a relief system. When power is supplied to the actuator, the
relief system closes, and the pump moves oil from the reservoir into the pressure
chamber. This action causes the piston to move downward in the cylinder, opening the
gas valve. When power to the actuator is interrupted, the relief system opens and the gas
valve closes in less than 0.8 seconds.
A position indicator, visible through the transparent portion of the terminal cover, shows
the entire stroke range of the actuator. A light, which is visible through the lower left
transparent portion of the terminal cover, indicates when the actuator receives power. An
optional, non-adjustable SPDT proof of closure over travel switch signals the closed
position after the gas valve has closed. An optional SPDT auxiliary switch is adjustable
between 40% and 100% of the stroke. The adjustment screw and scale are located on
the right side in the terminal box, and are visible through the transparent portion of the
terminal cover.
Installation
WARNING:
•
Personal injury or loss of life may occur if procedures are not followed
as specified.
•
All installations must be performed by qualified personnel only.
•
Do not pull the actuator shaft.
•
The AGA66 gasket must be installed between the actuator and the
gas valve body to provide NEMA 3, 3R, and 4 protection rating for
VGG= and VGD= valves.
•
The SKP15= actuator is directly coupled to the VG= series valve body by four pre-
mounted 4 mm Allen key screws.
•
The square mounting flange can be rotated in steps of 90
o
to provide four different
mounting positions. The SKP15= actuator can be mounted in any position except
upside down.
•
The actuator can be mounted or replaced while the valve body is under pressure.
•
The SKP15= actuator has two knock-outs for the installation of 1/2”-14 NPSM
conduit connections.
•
When conduit routing is connected, flexible conduit must be used.
•
Liquid tight conduit must be used in combination with AGA66 to provide NEMA 3, 3R,
and 4 protection.
•
The terminal marked GND, located above the wiring terminals, must be connected to
the electrical ground.
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