It works by preventing internal vacuum conditions that could result in burned out heaters and/or collapsed storage tanks. Installed on the cold water supply line, the Cash Acme VR20 closes tightly under pressure and opens at a 1″ mercury vacuum. Atmosphere admitted to the system breaks the vacuum, preventing collapse of the storage tank.

Vacuum relief valve water heaterdiagram

Sun Heating & Cooling has been providing high quality personalised service to the North Shore, Northern Beaches & Greater Sydney region for over 40 years. Sun Heating & Cooling was first established in 1969 in the northern beaches of Sydney. With over 40 years of experience, Sun Heating & Cooling is uniquely positioned to provide extensive advice on both gas & electric systems, customising a system according to a client’s specific needs, in relation to performance, energy efficiency & aesthetics. read more about us

Sun Heating and cooling PO BOX: 163,NARRABEEN NSW 2101 04 1196 7777 | 0432 680 000 Email: info@sunheatingcooling.com.au Office Hours: Monday to Friday 08:00am to 4:00pm

The VR20 Vacuum Relief Valve is designed to protect hot water supply systems and pressure vessels against negative pressure. It is especially well suited for many domestic and commercial systems.