Delta Corporation “PRV-15” pressure switch

The PRV-15 is a heavy-duty industrial pressure switch designed for compressor and pressurized water systems. Its core function is to automatically start and stop an electric motor (e.g., for a compressor) based on preset pressure thresholds, thereby protecting equipment and ensuring operational efficiency.

Key Features

• Pressure cut-out range: Approx. 7 to 15 kg/cm² (which equates to ~100 to 213 psi) for the PR/PRV-15 class. deltacorpo.com+2Imimg+2

• Differential (the difference between stop and start pressure): Roughly 1.7 to 2.3 kg/cm² (~24 to 33 psi) for this model range. Imimg+1

• Unloader valve built-in: The “PRV” variant stands for a pressure switch with an unloading valve. The unloading valve helps relieve the pressure over the compressor piston when the motor stops, improving motor and compressor lifespan. Imimg+1

• Mounting / connection: Designed for direct mounting on the air receiver via a ½″ BSP connection. The unloader valve port is typically a ¼″ flare connection to the compressor delivery line. Imimg+1

• Medium & fluid compatibility: Suitable for air and water applications. Can withstand media temperature up to approx. 100 °C (211 °F). Imimg+1

• Adjustability:

  • The stopping pressure is adjusted via a regulating nut. Imimg

  • The differential is adjustable via a regulating screw. Turning the screw anti-clockwise reduces the differential (meaning the start pressure comes closer to the cut-out pressure), and clockwise increases the differential. Imimg

• Electrical / motor compatibility: Provided as a triple-pole switch (for three‐phase or heavy duty single‐phase applications) in many instances. Imimg

• Robust industrial build: According to specification sheets, these switches are made with durable materials (e.g., Bakelite contact blocks for insulation) and finished with anti-corrosive coating for long life in industrial environments. Imimg

Typical Applications

• Air compressor systems (to automate start/stop once a set receiver/line pressure is reached)

• Pressurized water systems (e.g., water booster sets)

• Industrial pneumatic or hydraulic systems where maintaining or limiting pressure is critical

• Any system where you want automatic control of a motor based on pressure setpoints, with the added benefit of an unloader to reduce start-load on compressor pistons