The Humphrey 250V3-10-21 is a normally closed, manually actuated 3-way valve supplied with a mounting base for tank trailer pneumatic control circuits.
The Humphrey 250VB is a 3-way, normally closed manual control valve (model 250V3-10-21) used in pneumatic control circuits, supplied with a mounting base for panel installation. It directs compressed air to actuate downstream pneumatic components such as air interlocks and cylinders on tank trailers.