The XRV 127 utilizes a male rotor with four lobes and a female rotor with six flutes to achieve compression. Key features include: Variable Volume Ratio (Vi): Operators can manually adjust the volume ratio between 2.6:1 and 5.0:1 by turning a setting screw. Clockwise: Sets Vi to 2.6. Counter-clockwise: Sets Vi to 5.0. Capacity Control:
Through analyzing service calls for the XRV 127, field engineers report recurring mistakes that a simple read of the manual would prevent:
Periodically check the capacity slide valve indicator for accuracy. 6. Troubleshooting Common XRV 127 Issues
An advanced feature of this compressor is the variable volume ratio (Vi), which can be easily adjusted by altering the position of the discharge port. The manual's capacity control section describes a slide valve mechanism. This hydraulic piston-driven valve changes the compression start point, recirculating gas back to the suction side and offering continuous, approximately proportional energy savings when reducing load.
Use epoxy grout to fill voids beneath the baseplate. howden xrv 127 manual
For accurate and detailed information, it's essential to consult the official Howden XRV 127 manual or contact the manufacturer directly.
Oil is bled from the cylinder, allowing gas pressure or internal spring force to push the slide valve toward the suction end. This opens the bypass port and reduces the volume of compressed gas. Volume Ratio (Vi) Optimization
Twin-screw with an asymmetric profile (typically a 4-lobe male rotor and 6-lobe female rotor combination). Drive Types: Direct drive or gear-driven configurations.
Yes. Contact Howden support with your motor nameplate data (voltage, phase, full load amps). They will provide the correct schematic, often as a single-page PDF. The XRV 127 utilizes a male rotor with
: Confirm the capacity control valve is in the fully unloaded position.
Inspect oil filters for particulate matter. Run an oil analysis test to check for chemical breakdown, water contamination, and metal wear debris.
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Energize the oil crankcase heater for at least 24 hours before startup. Counter-clockwise: Sets Vi to 5
: Oil is supplied via differential pressure between the suction and discharge sides. Operating Procedures
Oil pressure releases, allowing the valve to open the bypass port, reducing power consumption. Pre-Start Checklist
Baseline vibration levels should be monitored at the bearing housings to catch early signs of mechanical wear. 5. Maintenance and Overhaul Schedule
Designed to meet standard industrial pressure requirements (typically up to 26–52 bar depending on the specific application sub-variant like high-pressure or standard refrigeration).
The tiny gap between the rotor faces and the discharge endplate. If this clearance is too tight, the rotors will gall against the casing; if too loose, volumetric efficiency drops drastically.
Setting the discharge port size allows for energy optimization. Clockwise: Sets Vi to 2.6. Counter-clockwise: Sets Vi to 5.0.