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A cartridge type check valve which may be either pilot operated or of the free flow type. The pilot operated type includes in combination a generally cylindrically-shaped housing having first and second end portions and having internal wall means defining an opening extending axially therethrough. A

A cartridge type check valve which may be either pilot operated or of the free flow type. The pilot operated type includes in combination a generally cylindrically-shaped housing having first and second end portions and having internal wall means defining an opening extending axially therethrough. A valve seat is formed on the internal wall means and a valve member is movable into and out of engagement with the valve seat to selectively prohibit and permit fluid flow through the axially extending opening at the valve seat. A fluid port is provided in the first end portion of the housing and serves to provide for fluid entrance into the axially extending opening. A control piston is positioned in the second end portion of the housing and is movable between first and second positions as is a valve stem, which is connected to the valve member and extends axially to a position adjacent the control piston and is adapted to be engaged and moved by the control piston. A valve guide is positioned in an intermediate portion of the housing and has a periphery located adjacent the internal wall means of the housing and this valve guide and the control piston define a fluid chamber therebetween. A stop shoulder is provided on the internal wall means and is engageable with the valve guide to limit movement of the valve guide in the direction of the valve seat. A central opening is provided in the valve guide which serves to slidably accommodate the valve stem and a fluid opening is provided in the valve guide for providing fluid communication between the fluid chamber and the axial opening at the first end portion of the housing. A spring member acts between the valve member and the valve guide tending to move the valve member into engagement with the valve seat and the valve guide into engagement with the stop shoulder. The free flow type also includes this structure with the exception of the control piston which is omitted and the fluid opening in the valve guide is enlarged. Another fluid port may be provided at the previous location of the control piston to provide for the entrance of additional fluid into the housing or it may completely replace the previously mentioned fluid port.

대표청구항 ▼

A pilot operated cartridge check valve including in combination a housing having first and second end portions and having internal wall means defining an opening, a valve seat formed on said internal wall means, a fluid port in said first end portion of said housing providing for the entrance of flu

A pilot operated cartridge check valve including in combination a housing having first and second end portions and having internal wall means defining an opening, a valve seat formed on said internal wall means, a fluid port in said first end portion of said housing providing for the entrance of fluid to said opening, a valve member movable into and out of engagement with said valve seat to selectively prohibit and permit fluid flow through said opening at said valve seat, a control piston positioned in said second end portion of said housing, and movable between first and second positions, a valve stem connected to said valve member and extending axially to a position adjacent said control piston, a valve guide positioned in an intermediate portion of said housing and having a periphery located adjacent said internal wall means of said housing, said valve guide and said control piston defining a fluid chamber therebetween, a stop shoulder on said internal wall means, said valve guide engageable with said stop shoulder in a first position to limit movement of said valve guide in the direction of said valve seat and said valve guide movable away from said stop shoulder to a second position toward said control piston, a central opening in said valve guide, said valve stem slidably extending through said central opening, a fluid opening in said valve guide providing for fluid communication between said fluid chamber and said axial opening at said first end portion of said housing, said valve guide in said first position permitting flow from said fluid chamber only through said fluid opening and in said second position permitting free flow around said valve guide to said fluid chamber, and a spring member acting on said valve member and said valve guide tending to move said valve member into engagement with said valve seat and said valve guide into engagement with said stop shoulder.