SUN Hydraulics date codes
SUN Hydraulics uses date codes on their cartridge valves to track the exact manufacturing date. In the attached document, the date key is explained. SUN Hydraulics date codes from 1986…

The new dual-acting pressure relief valve RBUY is an excellent choice for clamping applications with two cylinders where the cylinder area ratio is between 1.3 and 1.6. The RBUY is well suited for this as it features a unique internal pressure ratio of 1.8:1, providing machine builders with improved control during demanding clamping and unclamping cycles.
The valve is designed to fit the SC-10-02 cavity and is rated for 5000 psi (350 bar).