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Advanced Engineering 2020

NEC, Birmingham(B40 1NT)

04/11/2020 - 05/11/2020

The UK's largest annual advanced manufacturing trade show, Advanced Engineering is your opportunity to (more)

Drives & Controls Exhibition

NEC, Birmingham(B40 1NT)

25/01/2021 - 27/01/2021

The show brings together key suppliers of state-of-the-art equipment representing the multi-tasking culture (more)

Proportional flow control valve

Proportional flow control valve A new proportional flow control valve that gives engineers reliable, accurate and affordable pressure compensated proportional flow control has been introduced by Integrated Hydraulics. This small, simple, valve compliments the company’s proportional pressure compensated flow control circuits and other proportional and manually operated cartridges. It is designed to give pressure compensated flow control for flows up to 28 L/min, working at 210 bar. The valve makes innovative use of flow forces within the spool to achieve a fine level of pressure compensation in a very simple and cost effective cartridge. Designated PFR24A, the valve is of simple two port, spool type design and makes use of tried and tested components and technology. With no current applied, the spool blocks the ring of holes in the nose of the cartridge, preventing flow to the outlet port. As the current increases the increasing solenoid force acts on the spool to open it against the force of the spring, progressively uncovering the radial holes and permitting flow through the valve. If down stream pressure should fall, the flow rate would increase, but, due to some clever detail design, the increase in flow reduces the pressure behind the spool. The resulting pressure imbalance on either end of the spool creates a force that is added to the force of the spring, against which the solenoid is acting. This change in forces causes the spool to shift, restricting the flow path through the radial holes, thus maintaining near constant flow for any given input signal. Varying the current will alter the force applied to the spool and hence the flow through the valve.
 
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