This control opens when system upstream pressure is above the tagged and sealed set point pressure, and repeatedly reseats after operation. The valve is nonadjustable, factory set and sealed. The standard setting is 70 psig (4.8 bar). Ranges available: A, 0 to 150 psig (0 to 10 bar); or B, 30 to 300 psig (2 to 21 bar). Specify desired setting when ordering. Ideal also for high-to-low-side relief to avoid main pressure relief valve "popping." The setting is not affected by low side pressure changes