In consequence the invention is based on the object of avoiding the above disadvantages and providing a control valve which has a high closing force with a small actuating force, as well as facilitating a simple and compact construction.

The present invention relates to a valve particularly suitable for use in dispensing hot glue although it may be used for dispensing any fluid. The valve has a hollow discharge arm which turns the valve stem against a spring actuated piston.

It is common practice to employ disc or poppet valves for the above-described application, and several valve discs may be mounted on a common stem. The known valves quickly open the aperture in a valve seat when moving away from the same, and suddenly block liquid flow as they engage the valve seat.

Valve structure comprising a valve body, pilot valve within the balve body, a poppet valve having axially opposite ends operably associated with the valve body and pilot valve for actuation in response to actuation of the pilot valve and having check valve means positioned axially therein through wh

The pressure control device shown in FIG. has a high-pressure control valve, shown diagrammatically, with an adjusting drive. In the chromatography of supercritical flow media, the high-pressure control valve serves as a counter pressure control valve which keeps under specific, predeterminable pres

This invention relates to a valve, and more particularly a valve for use in controlling the flow of fluid or semi-fluid medium where the medium is very erosive and can also harden or set to foul the seating of a valve closure member on an associated valve seat.

hile valves of the so-called "butterfly" or "disc" type are widely known and used industrially, they have certain inherent operational limitations which curtail their utility.

Heretofore seat valves of this type have been designed in such a way that in the open position of the valve the frictional forces of the flow as well as the forces of reaction of the flow pressure act in an opening sense, i.e., contrary to the closing force of a spring, for instance.