A Brief Introduction to Shear Valves
Often referred to as a crash valve, a shear valve is a critical safety device which is installed under the petrol pump or dispenser. If the dispenser is knocked over or impacted, the valve breaks and shuts the line in both directions, preventing any leakage onto the forecourt. At Risbridger, we manufacture three types:
1) LPG Valve
· Suitable for liquid petroleum gas product lines (LPG, GPL, LP Gas, Autogas)
· Full flow low pressure drop design
· Avoids partial break interference and leak condition with displaced ball design
· Seals upstream and downstream on impact
· Consistent 420 Nm bending moment break
· 25 Bar pressure rating with 12:1 safety factor
· Includes brackets, bolts and instructions
· Non-spark brass construction, nitrile seals
· Optional end fittings and mounting kits available – including isolator valves
2) G2 or Stage 2 Vapour Valves
· Prevents leakage of saturated vapour onto the forecourt if the dispenser is impacted or knocked over
· Prevents vapour from tank farm returning to forecourt
· Allows maintenance staff to safely replace main valve once it is damaged
· Full flow low pressure drop design
· Avoids partial break interference and leak condition with dual opposed piston design
· Seals upstream and downstream on impact
· Cylindrical body fits through and allows sealing with standard membrane seals
· SIRA Certification: II 1/2 G SIRA 06ATEX9258U
· Includes brackets, bolts, isolator valve and instruction
3) Adblue Valve
· RIS-SHEAR-ADBLUE valves prevent leakage of Adblue product onto the forecourt when the dispenser is knocked over or impacted.
· The integral one-way valve helps retain line prime.
· Optional under pump valves which allows safe replacement of main valve once it has become damaged.
· Optional valves and flanges available for ensuring easy fitment to the dispensers.
