Parker’s family of direct acting cross-over relief valves feature a low leak and fast acting design that ensures pressure protection for double-acting cylinders, rotary actuators, and motors. These valves can operate with hydraulic system flows as high as 120 lpm (32 gpm) and pressures up to 350 bar (5000 psi) with a variety of pressure setting and adjustment options. Parker’s direct acting cross-over reliefs are ideal for applications that require pressure protection in both directions for rotary or linearly operated hydraulic units within mobile, industrial, or manufacturing markets.

Markets:
• Miscellaneous Industrial
• Miscellaneous Manufacturing
• Miscellaneous Mobile

Features/Benefits:
• Fast acting differential area reliefs for high flow capacity
• Low leak spherical poppets
• Mechanical stops eliminate spring solidification
• All external parts zinc plated

Applications:
• Port relief
• Swing relief
• Motor braking
• Cross port relief applications

Additional Technical Insight:
Dual crossover relief valves, often referred to as cross-port reliefs, provide pressure protection for double acting hydraulic actuators. They are typically used with equal area actuators including motors, double-rod cylinders and rotary actuators.  Providing relief protection in both actuator lines helps to prevent damage that may occur from pressure spikes or deadhead conditions in both operating directions.

Parker’s XR101 and A04J2 common cavity cross-port relief valves provide actuator pressure protection in both directions with a single cartridge valve.  They can be mounted in-line with standard line-bodies or integrated into custom manifolds.  Combining two relieving functions into a single cartridge reduces components, space and cost.

Parker’s XRDH family of cross-port relief valves uses two differential area relief valves combined into a single body. Utilizing the two cartridge approach allows for higher flows with lower pressure drops and lower pressure rise.   Standard catalog options are available for in-line plumbing or direct motor mount.  The XRDH103 motor mount option locates the relieving functions directly on the motor ports which reduces pressure clip response time and also reduces plumbing as compared to in-line cross-port reliefs.  XRDH103 is designed for use with Parker TB and TE low-speed-high-torque (LSHT) motors.  Other motor mount options are available upon request.

Please contact us if you have any questions, or if you have a cross-port relief application that requires higher flow and pressure requirements.