Series: VU The Stucchi check valve design is safe,compact and suitable to any hydrULic application using non-corrosive liquids. The VU size-range includes two different standard openings at to 65 psi. Material: steel with black phosphate Closing spring in C72 material Standard Crack psi and 65 psi Standard SAE and NPT threads Various crack pressures optional Central exhausting hole option Zinc plating available upon request Check Valves: VU Series Overview VU series are used in any type of hydrULic circuit Alternative uses: as pressure sequence valve by adjusting the internal spring loading to the required cracking point, according to the valve size Instructions for Use The VU series must be assembled in the circuit so that the direction of the flow corresponds to the direction of the arrow marked on the valve.