Vacuum relief valves are designed to enable you to control the vacuum level in your application. They restrict the vacuum pump performance by admitting air into the system, which reduces the vacuum level. Simple relief valves can be used for both single stage rotary vane pumps and dry vane pumps. They are generally an inexpensive method to control the vacuum level and are best used in conjunction with a vacuum gauge to set the pressure level. For expert selection of a suitable vacuum relief valve for your pump or system, call us on 1300 791 199.