Milwaukee, WI: 414.332.6000 l Eagan, MN: 651.890.0720

Siemens SKP55 and SKP75 Gas Actuators

Siemens SKP55 and SKP75 Gas Actuators

  • Excellent control for recuperative burners, burners utilizing preheated combustion air, and variable orifice/flow regulating burners
  • Air/gas ratio maintained even when air flow is disrupted
  • Safety shut-off control and pressure regulation in one compact unit
  • Compensates for variations in combustion chamber back pressure
  • Low-fire, excess-air biasing adjustment
  • Simplified commissioning of burner and reduced start-up time
  • Optimal solution for premix burner applications
  • Optional heating automatic thermostat
  • Globally approved: UL, FM, CSA, CE, EAC and RoHS  only when assembled to series VG valves.

Description

All SKP55 and SKP75 Series Electro-hydraulic actuators can be used in combination with any VG Series gas valve to provide safety shut‐off control for industrial and commercial burner applications.

Safety Shut-off function:
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 window of the terminal box cover, shows the entire possible stroke range of the actuator. A light, which is visible through the lower left transparent window of the terminal box cover, indicates when the actuator receives power. An optional, non‐ adjustable Single Pole, Double Throw (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 window of the terminal box cover.

The sealing gasket, AGA66, can be installed between the actuator and the gas valve to provide NEMA 3, 3R, and 4 protection rating for VGG10.xxxU / VGDxx.xxxU / VRD40.xxxU valves.

The SKP55.xxxUx actuator controls the pressure difference across a restriction in the gas supply line as a function of the pressure difference across a restriction in the air supply duct, so that the air/gas ratio remains constant irrespective of air volume changes. There is no need for an upstream constant pressure regulator when using an SKP55.xxxUx actuator within the applicable pressure range of the VGxxx.xxxU valve body.

The SKP75.xxxUx controls the burner manifold gas pressure as a function of the combustion air pressure. There is no need for an upstream constant pressure regulator when using an SKP75.xxxUx actuator within the acceptable pressure range of the VGxxx.xxxU valve body. If the combustion air pressure exceeds the permissible value of 12″ or 20″ w.c. (see Specifications), the pressure must be reduced by means of a pressure reducing T-fitting AGA78.

Accessory parts:
AGA28 – black bias spring for SKP55, for -0.4″ to 0.4″ w.c.
AGA75 – damping orifice for SKP75
AGA75.U1/4NPT – damping orifice for SKP75 with NPT threads
AGA78 – pressure reducing “T” for SKP75
AGA66 – sealing gasket

Ask us for engineering or product support.
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SIEMENS SKP55 and SKP75 SERIES:

US/Canada (UL Listed, FM Approved and CSA Certified only when assembled to series VG valves)
SKP55.011U1 – 110 Vac, Safety Shut-off Actuator, Proof of Closure (POF) Switch
SKP55.012U1 – 110 Vac, Safety Shut-off Actuator, POF and Auxiliary Switches
SKP55.013U1 – 110 Vac, Safety Shut-off Actuator, no Switches
SKP55.013U2 – 220 Vac, Safety Shut-off Actuator, no Switches

Metric (CE, EAC, RoHS Approval only when assembled to series VG valves)
SKP55.001E1 – 110 Vac, Safety Shut-off Actuator, Auxiliary Switch
SKP55.003E2 – 220 Vac, Safety Shut-off Actuator, no Switches

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SKP 75 Series:
US/Canada
 (UL Listed, FM Approved and CSA Certified only when assembled to series VG valves)

SKP75.011U1 – 110 Vac, Safety Shut-off Actuator, POF Switch
SKP75.012U1 – 110 Vac, Safety Shut-off Actuator, POF and Auxiliary Switches
SKP75.013U1 – 110 Vac, Safety Shut-off Actuator, no Switches
SKP75.012U2 – 220 Vac, Safety Shut-off Actuator, POF and Auxiliary Switches
SKP75.013U2 – 220 Vac, Safety Shut-off Actuator, no Switches

Metric (CE, EAC, RoHS Approval only when assembled to series VG valves)
SKP75.001E1 – 110 Vac, Safety Shut-off Actuator, Auxiliary Switch
SKP75.003E1 – 110 Vac, Safety Shut-off Actuator, no Switches
SKP75.003E2 – 220 Vac, Safety Shut-off Actuator, no Switches

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skp50The SKP50 has been replaced by SKP55

 

 

skp70The SKP70 has been replaced by SKP75

 

Technical Documentation

SKP55 and SKP75 Gas Actuators Technical Documentation

 

Video