Patent ID: 6247497
Filing Date: 2001-06-19
Classification: F16K,F25B,Y10T

Abstract:
A rotary channel-selector valve, comprising:a valve housing being in a cylindrical shape;a main valve element provided in the valve housing rotatably and axially movably;a valve-seat plate fixed to the valve housing and having a low pressure port connected to a low pressure piping, a high pressure port connected to a high pressure piping, and at least one switching port;a pilot valve supported by the main valve element by axially movably engaging a valve holding hole formed in the main valve element for selectively connecting the low pressure port to a pressure chamber formed on one end surface side of the main valve element and suffering pressure of the high pressure port by opening or closing a valve port formed on the main valve element; andan electromagnetic solenoid for rotating the main valve element and for opening or closing the pilot valve,wherein an end surface, facing oppositely to the pressure chamber, of the main valve element is put into contact with the valve-seat plate and the main valve element selectively connects the switching port to either one of the low pressure port and the high pressure port by rotation of the main valve element itself, and the pilot valve consists separately of a stem portion engaging the valve holding hole axially movably and attracted by the electromagnetic solenoid and of a needle valve portion to open or close the valve port so as to enable the needle valve portion to shift radially and axially with respect to the stem portion.