Q-VAC Automatic Priming Systems

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Accessories for Vacuum Priming Systems

Priming Valves   Priming Chambers   Water Traps 

Priming Valves

Priming Valve

Our standard float-operated air-release valves have been specifically designed for priming applications and comply with both AWWA C512 standards and NSF 61 requirements. The heavy-duty cast iron body and cover include a durable, non-stick fusion bonded epoxy coating inside and out for exceptional abrasion and chemical resistance.  The internal trim is all 316 stainless steel to provide long life, even in aggressive water.  The long body design and level sensitive float eliminate leakage concerns.

Priming Valve Features
Priming Valve Features

A weatherproof proof-of-prime level switch, sometimes referred to as a “pump protector”, is normally used to signal when a pump is primed, or to provide warning if the prime has been lost.  This signal can be connected to the centrifugal pump’s motor controller or to a prime status alarm.  A SPDT switch is standard; however a DPDT switch is available upon request.

Priming Valve Dimensional Information

Priming Valve Dimensions
Priming Valve Dimensions

Even a properly sized priming system will not operate as desired if there are flow restrictions caused by improperly sized valves or piping.  The chart below should be used to identify the correct priming valve size for each application.  One priming valve should be used for each pump connected to the priming system.  For larger flow rates, our HFPC series priming chambers should be considered.

Priming Valve Flow Capacities


Priming Chambers
Our standard priming chambers operate automatically and are designed for high flow applications where the use of typical priming valves would be too restrictive and costly.  Standard features include an ASME code vacuum chamber constructed with butt joint weld circumferential joints, NSF 61 epoxy coated interior, flanged inlet, pneumatic isolation valve, 316 stainless steel level probes, and automatic controls and indicators housed in a NEMA 4 enclosure.


  Water Traps

Water Trap

As a recommended accessory, a water trap can be installed in the main vacuum line to provide additional protection against flooding the priming system.  Our CVA series water traps includes a corrosion-resistant aluminum head, a clear polycarbonate housing to show accumulated liquid, an internal baffle to separate harmful liquids from the inlet air, a stainless steel separator screen, a 316 stainless steel ball float, inlet and outlet isolation valves, a vacuum release valve to facilitate draining, a drain valve, and a liquid filled vacuum gauge.  Standard connection sizes are available from 1/2” to 4” NPT.

Standard Features of Q-VAC Water Traps

  • Corrosion-resistant aluminum head

  • Integrated liquid knock-out baffle

  • Shatter-resistant polycarbonate housing

  • Stainless-steel separator screen and float ball

  • Manual drain valve

  • Vacuum release valve with silencer Isolation valves

  • Liquid-filled vacuum gauge

  • T-style configuration minimizes piping

  • Mounting bracket tap hole guides

  • Compact design

Water Trap Specifications
Water Trap Specifications

We offer the best value in quality automatic vacuum priming systems for centrifugal water pump priming, siphon control systems, and water box primers.  Q-VAC Priming Systems are ideal for power plants, municipal water systems and wastewater treatment plants, industrial applications, irrigation systems, steel mills, and marine applications.  Please contact us for expert assistance in selecting the best solution for your application.

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