Product category:
Hydraulics and Pneumatics
News Release from: Hydraulic System Products | Subject: In-line check valves
Edited by the Processingtalk Editorial
Team on 09 November 2006
In-line check valves for BSPP, NPT and
SAE
Whilst increasing the size coverage of the BSPP and NPT check valve ranges, a complimentary SAE range has been introduced, to provide a comprehensive selection for hydraulic engineers
Whilst increasing the size coverage of their BSPP and NPT check valve ranges, Hydraulic System Products have also introduced a complimentary SAE range to provide a comprehensive selection for hydraulic engineers The extended range now means that BSPP threaded options are in eight sizes ranging from 1/4'' to 2'' with rated flows from 23 to 550L/min, NPT thread options are in nine sizes from 1/8'' to 2'' with rated flows from 9 to 550L/min, and SAE 'O' ring type thread options are in seven sizes from 7/16''-20 to 1.7/8''-12 with rated flows from 23 to 345L/min
This article was originally published on Processingtalk on 11 Jul 2006 at 8.00am (UK)
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Other than size differences, all the valves have the same common 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 bar, 1.00 bar, 2.00 bar and 4.5 bar.
Where a restricted return flow is needed, e.g to provide an automatic controlled descent 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 'in-line' with the same female thread configuration at each end and have an all steel construction suitable for working pressures up to 350 bar.
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 x 16 mm across flats and the largest is 201 x 80 across flats.
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