1/4" Anti-Vacuum Valve
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Also called siphon, anti-siphon or vacuum breaker valve. This valve allows air to escape the boiler as the water heats up, hissing and then closing off when the boiler water reaches it's operating temperature, sealed by the steam pressure created. Measure your existing valve: the outside of the male threads of a 1/4" BSP fitting measure 1/2". One may also use part W_517.
Gaskets are not always required; as the valve and boiler expand any small leaks at the junction will likely disappear forever. A good rule of thumb: if your valve and boiler had a gasket, get a new replacement for added assurance.
|Manufacturer||Nuova General Instruments|
Stainless steel made available as of 06/01/2019.
I was happy to find the replacement valve (and in stock) for a customer’s 3 Group Astoria. Shipping was quick, the part was reasonably priced and a perfect fit for the replacement...
First I want to say that the new Stainless Steel version of this vacuum valve / breaker will work with copper tanks as well. There shouldn't be any damage caused by mixed metals.. I've double checked this out for myself. This Vacuum valve works great for the machines noted, as well as the Rocket R58 #17 (exploded view) P/N C219900560 "Antisuction valve". Went right in with no problems and solved the bubbly leaking and hissing from the top of my steam tank while under pressure.