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Vacuum Pressure Switches

ITT NeoDyn's Vacuum Pressure Switches come in two types:

  • A negative rate type pressure switch (i.e., a Belleville spring) is a snap acting device. At a certain pressure (apex of the spring curve) the spring snaps over center. At this point, it takes pressure (force) to continue its movement. The pressure switch set point is a function of the Belleville spring. The electrical switch is in a fixed position and is synchronized to the movement of the Belleville. Our Neo-Dyn switches feature a negative rate Belleville spring snap acting device which offers greater set point stability, vibration resistance, over-pressure capability and cycle life.
  • A hermetically sealed enclosure is completely sealed from the environment and our Neo-Dyn hermetically sealed electrical assemblies are all metal with a glass header. All joints are soldered or welded to insure sealing integrity. Our explosion-proof enclosure is capable of withstanding an explosion which may occur within, and capable of preventing the ignition of an explosive atmosphere which may surround it. Plus you get the same benefits from our Belleville spring; greater set-point, vibration resistance, capability and cycle life.


142P Ultra Low Vacuum (Explosion Proof)

Series Ultra Low Vacuum/Pressure Switch is designed for low pressure and vacuum to pressure crossover and features many applications with a wide range of internal wetted materials that replace the necessity for diaphragm seals. Good for hazardous or corrosive environments. Enclosure 6.

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142P Ultra LowVacuum (Weather Proof)

Series Vacuum Pressure Switch/Internal Adjustment. Designed for vacuum to pressure crossover (142P) and features many applications with a wide range of internal wetted materials that replace the necessity for diaphragm seals. Enclosure 3.

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180P High System Pressure (Weather Proof)

Series Vacuum Pressure Switch/Internal Adjustment. The 180P is a low range adjustable vacuum switch. Weather proof enclosure and stable set points during system pressure changes make this switch ideal for a wide variety of applications. Enclosure 3.

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181P Compact Vacuum Switch (Weather Proof)

Series Vacuum Switch/Internal Adjustment. Compact, adjustable vacuum switch for pneumatic and low impulse hydraulic process applications. Our Nega-Rate® Belleville disc srping offers superior set point stability and vibration resistance. The 181P series pressure switch also has a selectable deadband feature which can be preset. Enclosure 3.

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182P Adjustabe Thru Port Cap (Weather Proof)

Series Vacuum Switch/Tamper Resistant. This compact versatile vacuum switch is suitable for numerous applications serving low to mid-range vacuum applications. After adjustment and installation the units become tamper proof. Enclosure 3.

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142P Ultra Low Vacuum (Explosion Proof)

Series Vacuum Switch/Internal Adjustment. This switch is designed for vacuum to pressure crossover and features many applications with a wide range of internal wetted materials that replace the necessity for diaphragm seals. Good for hazardous or corrosive environments. Enclosure 6.

More details

181P Compact Vacuum (Explosion Proof)

Series Vacuum Switch/Internal Adjustment. Compact, adjustable vacuum switch for pneumatic and low impulse hydraulic process applications. Our Nega-Rate® Belleville disc srping offers superior set point stability and vibration resistance. The 181P series pressure switch also has a selectable deadband feature which can be pre-set. Enclosure 6.

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182P Adjustable Thru Port Cap-Vacuum (Explosion Proof)

Series Vacuum Switch/Tamper Resistant. This compact versatile vacuum switch is suitable for numerous applications serving low to mid-range vacuum applications. After adjustment and installation the units become tamper proof. Enclosure 6.

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