Parker’s new pressure compensated proportional valves.
Published in: Diesel Progress North American Edition
Date: 8/1/1997
Parker Hannifin Corp.’s Hydraulic Valve Division has launched new mobile control valves included in the firm’s MMV-IPC valve series. The valve systems incorporate a single pressure compensator for each four-way directional control section, a built-in shuttle system to direct pressure signal to the inlet and a stackable design. These features enable them to offer accurate and predictable metering through the entire flow range to provide smooth acceleration and deceleration. The valve systems are targeted for use in aerial lifts, cranes and other mobile equipment.
The Hydraulic Valve Division of Parker Hannifin Corp. has introduced a new generation of mobile motion control valves as part of the company’s MMV-IPC valve series. The valves are targeted toward applications requiring precise control of load, speed and direction, such as aerial lifts, cranes, automated material handling equipment, conveyors, digger derricks, forestry equipment and other mobile machines.
The MMV-IPC valve systems incorporate an individual pressure compensator for each four-way directional control section. This feature provides independent simultaneous operation for applications requiring precise metering when two or more hydraulic functions are used simultaneously, Parker said. The built-in pressure compensation also reduces costs by eliminating the need for external pressure-compensated flow controls, pressure-reducing valves or flow dividers.
Series 6 MMV-IPC valves incorporate a built-in shuttle system that directs the pressure signal from the highest pressure function to the inlet. According to Parker, this ensures that the system supply pressure will be greater than the highest load experienced up to the highest pressure rating.
The stackable design of the series 6 valve multiple functions to be combined into one compact package. The series 6 valve can also be combined with other larger MMV proportional valve sizes or with manifolds and cartridge valves, allowing all or a portion of a machine’s hydraulics to be designed into one package.
The valves offer accurate and predictable metering throughout the flow range, thus providing smooth acceleration and deceleration, Parker said. They are controlled by proportional, push-type, oil-immersed solenoids which supply precise metering characteristics. Each valve section is individually compensated by means of a returnline sensing orifice that applies differential pressure to the ends of the main metering spool. The valves can be operated electrically and/or with optional manual override levers.
The series 6 valves provide precise metering characteristics at flows from 0.5 to 8 gpm and pressures up to 4000 psi, regardless of the load. They are direct acting and do not require external pilot or drain lines, null adjustment or special filtration, the company said. A variety of options includes overload relief valves, cross-over relief, and a choice of fixed or adjustable flows on each cylinder port.
The series 6 valves are the first of a new range of MMV-IPC valves which will include larger series 10, 12 and 16 sizes.
COPYRIGHT 1997 Diesel & Gas Turbine Publication