Pressure relief valves are intended to protect system components from over pressurization. The pressure relief valve is often set at 10% over maximum system operating pressure to allow the system to operate up to the maximum working pressure rating. The maximum allowable working pressure for the system is based on the lowest rated system component. The size must be chosen to allow the rate of relief flow to equal or exceed the potential various sources of over pressurization. Materials of construction must be chosen to be compatible with the fluid or gas that will be encountered. Poor material choices could lead to faulty operation of the relief valve and failure to relieve overpressure as intended.
Features of MAXPRO®’s High Pressure Relief Valves
Proportional high pressure relief valves from MAXPRO® are designed with simplicity in mind. The goal is to support long term reliability, performance, and serviceability, while providing the safety relief valve function. The relieving function is accomplished by an adjustable spring force acting upon a stem that presents two unequal areas for inlet pressure to act upon, causing stem lift off the seat. The higher the spring force, the higher the relieving pressure. With the proportional relief valve design, higher system pressure causes higher stem lift, resulting in higher relieving flow. This “unbalanced stem” design also provides for smoother operation over those that simply lift from the stem area under the seat and minimizes the reseating pressure window as well as hysteresis of the set pressure. These valves are not poppet style relief valves. At a preset pressure, poppet style relief valves “pop” full open for maximum flow, and then snap closed at some reseating pressure. Poppet style valves tend to be more complex to achieve the pop-open action.
MAXPRO® offers proportional relief valves with four minimum/maximum set pressures to support most applications. Choose from:
- Model # MT3RV (500 psi – 3,000 psi)
- Model #MT10RV (1,000 psi – 10,000 psi)
- Model #MT25RV (2,500 psi 25,000 psi)
- Model #MT66RV (10,000 psi – 66,000 psi)
Note: The sensing pressure enters the side port and exits the bottom port. MT3RV and MT10RV have two standard side ports. The second port can be for a tee for a gauge or vent line, or the extra side port can be plugged if preferred. MT25RV and MT66RV have one sensing port.
Speak to a MAXPRO® Engineer
Please contact us today to discuss your overpressure protection application with one of our helpful engineers.