In an effort to reduce noise, simplify plumbing and improve the efficiency and the life of the dry valve pump, Permco has developed a by-pass valve that is built into the port end cover. This valve opens as the dry valve is closed to allow a reasonably unrestricted flow back to tank. It minimizes outlet back pressure that causes dry valve pumps to become noisy if cavitation is permitted to occur. Typically this back pressure is caused by downstream restrictions in the open center valve system and the long hoses associated with return lines.
This patented design allows for approximately 2 GPM to flow directly back to tank when the pump is in the dry mode. When the pump is returned to the normal operating mode (wet mode) this valve closes to eliminate any loss of power through the bleed off of fluid. This valve, integral to the port end cover requires a 3/8" line back to tank.
Permco's system eliminates the horsepower loss associated with competitors models which allow oil to continue to flow to tank during the operating mode. Is also minimizes the back pressure that makes dry valve pumps noisy and the premature failures caused by this back pressure. These are available for the P5000/5100 and P7500/7600 dry valve pumps. This option is a net adder when ordered as an option on a dry valve pump (or port end cover) and is designated by the DVBP (Dry Valve By-Pass) at the end of the model or part number. When ordering either of the above port end cover assemblies for dry valve applications, please incorporate the following components into your pump assembly:
By installing these components in your dry valve pump assembly, optimun performance is assured.
PART # / DESCRIPTION
YZ-0592-DVBP / P5000 DRY VALVE BY-PASS PEC
YZ-0592D-DVBP / P5100 DRY VALVE BY-PASS PEC
XZ-0592-DVBP / P7500 DRY VALVE BY-PASS PEC
XZ-0592D-DVBP / P7600 DRY VALVE BY-PASS PEC
When ordering either of the above port end cover assemblies for dry valve applications, please incorporate the following components into your pump assembly:
PART # / DESCRIPTION
ZZ-0947-DV / P3000/3100 DRY VALVE THRUST PLATE
KA-0558-DV / P3000/3100 DRY VALVE RING SEAL
X-0947-DVS / P5000/5100 DRY VALVE THRUST PLATE
MA-0558-DV / P5000/5100 DRY VALVE RING SEAL
AZ-0947-DVS / P7500/7600 DRY VALVE THRUST PLATE
VA-0558-DV / P7500/7600 DRY VALVE RING SEAL
By installing these components in your dry valve pump assembly, optimun performance is assured.