Double force drived leading type electromagnetic valve

Application Number: 00107071
Application Date: 2000.04.27
Publication Number: 1271821
Publication Date: 2000.11.01
Priority Information: 1999/4/27 JP 120046/1999
International: F16K3/24;F16K31/06;F16K31/124
Applicant(s) Name: SMC Corp.
Inventor(s) Name: Misumi Tesshi;Ishikawa Makoto
Patent Agency Code: 11038
Patent Agent: chen jian
Abstract A pilot-type solenoid valve capable of driving a valve member by increasing a pilot fluid pressure from a pilot valve and reliably switching valve member. The pilot-type solenoid valve includes a main valve portion having a valve member capable of sliding in a valve hole to which ports P, A, B, EA and EB in a valve body are opened, a pilot driving mechanism for applying a pilot fluid pressure to a pushing member which pushes one end of the valve member, and a returning mechanism for applying a returning force to the valve member. The pushing member includes a first piston for applying the pilot fluid pressure, and a second piston which is pushed by the first piston and which pushes the valve member. A shaft of the first piston passes through a partition wall in a sealing manner and abuts against the second piston. The shaft is provided therein with a guide hole for guiding the pilot fluid pressure to a pressure chamber of the second piston.