Nason Pressure Switches

Nason Pressure Switches

Nason’s complete line of pressure switches offers design engineers a choice of low to high pressure switch models ranging from 2 PSI to 7500 PSI. Our pressure switches utilize a long-life elastomer diaphragm that engages a snap action switch for consistent and accurate operation. Our high pressure models use a proven sealed piston sensor to withstand the highest pressures. Models are available for both pneumatic and hydraulic applications. Please check out our selection of pressure switches from Nason down below to see which type best suits your needs. 



  • CD Series
  • CF Series
  • XM Series
  • WX Series


  • CJ Series
  • MM Series
  • SQ Series
  • LM Series
  • SM Series

Pure Aqua has over 20 years of experience as a global provider of Nason Pressure Switches. Users can expect excellent quality, quick delivery and friendly service any time you order Nason Pressure Switches from Pure Aqua. 

All of Nason’s pressure switches use a snap-action electrical device activated by an elastomer diaphragm or piston, offering a precise and repeatable design. The snap-action-design will maintain its state with contacts either open or closed, until a precise set point is reached when it will snap over center to a new state. It will remain in that state until a distinct change towards its original setting is sensed, at which time it will snap back to its original state. The design s snap-action feature prevents contact intermittency near its switch point, which is common in creeper designs. As system pressures fluctuate, our switches inherent differential prevents searching. Nason’s uses only the highest quality snap-action switches. These switches and Nason’s are UL, CSA, and military approved.

Our elastomer diaphragm and pistons move a precise .040 of an inch to ensure accurate instantaneous contact under all types of operating conditions. While nitrile is preferred for general use for diaphragms, we can also provide ethylene, propylene, fluorocarbon, fluosilicon and neoprene depending on what fluid you are using. Nason test every switch for accuracy prior to shipment.

Under most operating conditions, Nason switches have a service life of over one million cycles. Smart design, quality components and careful assembly make a switch that easily outlasts the competition.

We offer adjustable and factory preset models that are customizable for you design. We offer media connections in NPT, SAE and BSPP, as well as numerous electrical connections for any application.

Nason uses only the highest quality snap action electrical switches which insure a positive, instantaneous electrical contact under all operating conditions.

Nason pressure switches incorporate elastomeric diaphragms to provide a positive media seal. Nitrile is the material of choice for most applications; ethylene propylene, fluorocarbon, fluorosilicon, and neoprene are readily available for specific applications.

Specifications Include:

  • Set Point Range 10 – 4500 PSI (.69 – 289 Bar)
  • Set Point Tolerance ±5 PSI or 5% (.34 Bar)
  • Maximum Operating Pressure 5000 PSI (344 Bar)
  • Proof Pressure 15000 PSI (1034 Bar)
  • Differential 10 – 20%
  • Current Rating 5 A @ 250 VAC
  • 5 A @ 30 VDC (Resistive)
  • Media Connection See Order Chart Below for Options
  • Circuit Form SPST-NO or SPST-NC
  • Electrical Connection See Order Chart in pdf for Options
  • Diaphragm material Buna (Ranges 1 – 3)
  • Stainless Steel Piston (Ranges 4 – 7)
  • Cycle Life 1 Million