Technical Data
Technical Data
Valve function
Maximum fluid working pressure . . . . . . . . . . . . . . . . . . .
Maximum air working pressure. . . . . . . . . . . . . . . . . . . . .
Minimum air working pressure . . . . . . . . . . . . . . . . . . . . .
Maximum fluid temperature . . . . . . . . . . . . . . . . . . . . . . .
Inlets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Outlets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wetted parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Normally open by spring; air to close; air assist to open 7250 psi (50 MPa, 500 bar)
100 psi (0.7 MPa, 7 bar)
60 psi (0.4 MPa, 4 bar) 160°F (71°C)
1/2 npt (f)
255478: 1/2 npt (m)
245846: 3/8 npt (f)
carbon steel, zinc plating, carbide, polyethylene, leather; fluid housings on 255478 are electroless nickel plated
Dimensions
4.25 in (107.95 mm)
Close signal
1/4 in. or 5/32 (4 mm) tube fitting in 1/8 npt (f) See parts list, page 10.
Open signal 
1/4 in. or 5/32 (4 mm) tube fitting in 1/8 npt (f) See parts list, page 10.
(2)1/2 npt (f) inlets 
180° apart; also
accepts 255278 circulation valve.
(2)3/8 npt (f) ports 90° apart
1/2 npt (m) outlet
7.08 in (179.8 mm)
1.53 in (38.86 mm)
3.66 in (92.96 mm)
r_313259_313342_20
313342D | 11 |