Historical
NFPA/T3.5.1 R2-2002
Hydraulic fluid power - Valves - Mounting surfaces
This standard includes mounting surfaces for the following: directional control valves; compensated flow control valves; check valves; pilot operated check valves; pressure control valves; sequence valves; throttle valves; unloading valves; pressure relief valves. This standard includes the following dimensional criteria: minimum surface dimensions; sizes and locations of tapped holes for mounting bolts; sizes and locations of ports; sizes and locations of dowel or rest pins where required. This standard provides the following general criteria: surface finish and flatness; indication of tolerances where pertinent; indication of appropriate radii. This standard only applies to the dimensional criteria of products manufactured in conformance with this standard.ÿ The maximum working pressure for subplates and manifold blocks with this mounting surface shall be supplied by the manufacturer
National Fluid Power Association [nfpa-fluid]