Solenoid valve

A solenoid valve comprising a valve body having a valve cavity,

• first port means disposed on said valve body and communicating with said valve cavity,
• second port means disposed on said valve body and communicating with said valve cavity,
• an orifice member having an orifice, with said orifice member mounted in said valve cavity and disposed separating said first and second ports,
• electrically operated solenoid means mounted on said valve body and including a solenoid coil and armature means disposed for actuation by said solenoid coil,
• diaphragm means mounted in said valve cavity,
• poppet means formed as part of said diaphragm means with said poppet means operative to close said orifice,
• with said diaphragm means and said poppet means comprising an integrally formed unitary member and with said poppet means comprising a semi-sperical end portion and a conical portion with said conical portion having a larger diameter and a smaller diameter and with said larger diameter of said conical portion disposed adjacent said semi-spherical end portion, and said smaller diameter disposed adjacent said diaphragm,
• resilient means mounted in said valve cavity and disposed to bear on said diaphragm means and bias said diaphragm means and said poppet means in a first direction,
• pressure plate means disposed in said valve cavity and supporting a portion of said diaphragm means thereby enhancing the ability of said diaphragm means to withstand fluid pressure and with said solenoid means capable of biasing said diaphragm and poppet means in a second direction which is opposite to said first direction.