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Building and Industry



Wilkins 460 Series

The innovative design protects against spillage that a normal Pressure Vacuum Breaker exhibits during start up, allowing for indoor installation. The air inlet closes before the check valve opens. Wilkins’ designs continue to set the standard in water control products and the Model 460 Spill Resistant Pressure Vacuum Breaker is evidence of this continued effort. With unique design features, the 460 has unsurpassed reliability and in-line maintainability of any valve in its class. A Phillips screwdriver is all that is needed to work on the 460 - the bonnet tool and seat tool are built into the canopy and bonnet of the valve. The internal cartridge pulls out of the body with no threading, making the 460 the easiest to maintain SPVB on the market. Currently available in 3/8” and 1/2” sizes.

46 00 XX


  • Spill resistant feature allows indoor installations.
  • Replaceable modular internal construction.
  • Bonnet and seat removal tool built into canopy.


The Spill-Resistant Pressure Vacuum Breaker shall be ASSE® 1056 Listed, and supplied with full port ball valves. The assembly shall utilize a bronze (ASTM B 584) main body and an integrated modular check and float assembly made from thermoplastics. Springs shall be stainless steel. The valve shall incorporate a diaphragm to separate the air inlet from the potable water supply preventing spillage. The Spill-Resistant Pressure Vacuum Breaker shall be a Wilkins Model 460.


Designed for installation on indoor and outdoor point of use applications to protect against backsiphonage of contaminated water into the water supply. During startup and operation a separate diaphragm seals the air inlet from the water supply preventing spillage. The assembly is designed for use under constant pressure and provides protection where a potential health hazard exists.

Flow Characteristics


Sizes:  3/8", 1/2", 3/4", 1"

Maximum working water pressure 150 PSI

Maximum working water temperature 180°F

Hydrostatic test pressure 300 PSI

Threaded connections ANSI B1.20.1

Replaceable thermoplastic modular cartridge

Spill resistant feature for indoor use

Typical Installation

Local codes shall govern installation requirements. Unless otherwise specified, the assembly shall be installed in accordance with the manufacturers’ instructions and the latest version of the Uniform Plumbing Code. The critical level mark on the assembly shall be mounted at a minimum of 12” (305mm) above the highest downstream piping or outlet. Install with sufficient side clearance for testing and maintenance. The installation shall insure that no part of the assembly can be submerged. A spill-resistant pressure vacuum breaker cannot be installed where back-pressure could occur.

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Product code

Wilkins 460 Series

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