Abstract: A control valve includes a valve body having an inlet port and an outlet port which receives an orifice plate mounted to the valve body. Set within the valve body is a plunger which cooperates with the orifice plate to selectively communicate the inlet port with the outlet port. The plunger is acted upon by a stem for displacement in an axial direction between a closing position and an opening position and provided with a servo system for maintaining the desired position of the plunger. The servo system includes a slide gate which is connected to the stem and opens and closes the fluid passageways between the inlet port, outlet port and a pressurizing chamber above the plunger.

Abstract: A safety valve for preventing overpressure in plants operating with gaseous and/or vaporous and/or liquid fluids and/or mixtures includes a valve body with a valve seat and a valve member which controls the valve seat and includes a seat valve and a valve piston securely fixed to the seat valve at a distance thereto.

Abstract: A control valve includes a valve box whose interior accommodates a valve needle closing against a valve seat. The interior of the valve box is subdivided in sections with at least two conical bores with different cone angles for improving the flow guidance and providing more uniform velocity distribution.