Check valves cover all standards
A
Hydraulic System Products product story
Edited by the Engineeringtalk editorial team
Nov 10, 2006
Check valve ranges expand to provide a comprehensive selection for hydraulics engineers.
As well as increasing the size coverage of its BSPP and NPT check valve ranges, Hydraulic System Products has introduced a complimentary SAE range to provide a comprehensive selection for hydraulics engineers.
The extended range now means that BSPP thread options are in eight sizes ranging from 0.25 to 2in with rated flows from 23 to 550 litre/min, NPT thread options are in nine sizes from 0.125 to 2in with rated flows from 9 to 550 litre/min and SAE O-ring type thread options are in seven sizes from 0.4375in-20 to 1.875in-12 with rated flows from 23 to 345 litre/min.
Other than size differences, all the valves have the same features and perform the same function.
They are used in fluid power systems to create a hydraulic lock in a cylinder or component.
A poppet valve unseats against a light spring to allow free flow in one direction then as the flow stops the poppet valve reseats to prevent return flow thereby locking the load.
The cracking pressure required to open the valve for free flow is governed by which spring is fitted.
There are four options: 0.35, 1.00, 2.00 and 4.5bar.
Where a restricted return flow is needed, eg to provide an automatic controlled decent of a load, an optional orifice is machined through the poppet valve.
The diameter of the orifice is dictated by the individual application.
The valves are "inline" with the same female thread configuration at each end and have an all steel construction suitable for working pressures up to 350bar.
Poppet valves are case hardened and the exterior of the hexagonal section body has a black oxide finish to resist corrosion.
Across the three ranges, the smallest unit is 54mm long by 16mm across flats and the largest is 200 x 80mm.
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