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Siemens SKP25 Series Technical Instructions

Pressure regulating gas valve actuator with safety shut-off function
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SKP Series
SKP25 U.. Pressure Regulating Gas
Valve Actuator with Safety Shut-off
Function
Description
Features
Only when assembled to Series VG U Gas valves
SKP25
pressure regulating electro-hydraulic actuators combine with VG
valve bodies to provide safety shut-off and gas pressure regulation for industrial and
commercial burners. The SKP25
or zero governor.
Since a single valve performs two or more functions, fewer gas train components and
fittings are required. This significantly reduces both the size and weight of the gas train.
In addition, smaller diameter gas valves can be used.
The compact SKP25
interrupted. The modular design allows the SKP25
VG
series gas valve bodies from 1/2-inch to 6-inch in size. The actuator is easily
mounted on the square flange of any VG
visible position indicator on the front of the actuator displays the entire stroke of the
valve. A light indicates when the actuator is powered.
UL listed, FM approved, CSA certified for USA and Canada, and ISO 9001
certified. European, Australian and Japanese approved versions available.
Certified as a ventless pressure regulator.
Safety shut-off function and pressure regulating function in one compact unit.
Proof of Closure with Over Travel (POC) versions.
Optional NEMA 4 protection.
Visual position indication.
"Power on" indication light
Quick connect wiring terminals
Optional adjustable auxiliary switch available.
Applicable as 1:1 air/gas proportionator or zero governor.
Accurate pressure control characteristics, and zero offset (droop).
Modular design with 360
Low, 13.5 VA power consumption.
Integral regulation leak limiter
Technical Instructions
can also be applied as a 1:1 air/gas proportionator
actuator opens slowly and closes immediately when power is
valve with four pre-mounted screws. A
o
actuator rotation for easy field wiring and installation.
Document No. 155-752
SKP25 U..
July 9, 2014
to be used in combination with all
Siemens Building Technologies, Inc.
series gas

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  Summary of Contents for Siemens SKP25 Series

  • Page 1 Applicable as 1:1 air/gas proportionator or zero governor. • Accurate pressure control characteristics, and zero offset (droop). • Modular design with 360 actuator rotation for easy field wiring and installation. • Low, 13.5 VA power consumption. • Integral regulation leak limiter • Siemens Building Technologies, Inc.
  • Page 2: Specifications

    50 to 60 Hz +6% Power consumption 13.5 VA Duty cycle continuous Operating environment Ambient operating temperature 5°F to 140°F (-15°C to 60°C) Mounting position Any position except upside down Maximum inlet gas pressure Same as VG series Page 2 Siemens Building Technologies, Inc.
  • Page 3 Minimum time required for high to low fire 5 seconds load changes Auxiliary features Proof of closure switch Non-adjustable Setting range of auxiliary switch 40% to 100% of stroke Switch rating 6A/250 Vac resistive; 3A/120 Vac pilot duty Siemens Building Technologies, Inc. Page 3...
  • Page 4: Operation

    Unlike the conventional direct acting regulators, the SKP25 servo operated regulating system displays virtually zero droop (offset) across the turndown range. Page 4 Siemens Building Technologies, Inc.
  • Page 5: Installation

    Do not use the taps on the valve body for the gas sensing line connection since these locations typically have strong turbulence. The pressure connection pipe should be as short as possible to allow the regulator to react to sudden changes. Siemens Building Technologies, Inc. Page 5...
  • Page 6 NOTES: 1. The auxiliary switch is adjustable between 40% and 100% of the stroke. The factory setting is at 40%. 2. The auxiliary switch must not be used for proof of closure detection or other safety interlock functions. 3. The Proof of Closure Switch is non-adjustable. Page 6 Siemens Building Technologies, Inc.
  • Page 7 Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as design improvements are introduced. Other product or company names mentioned herein may be the trademarks of their respective owners. © 2005 Siemens Building Technologies, Inc. SCC Inc.

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