Solenoid valve, especially an outlet valve for infusion water
First Claim
1. In a solenoid valve, having a valve housing, means forming a valve chamber in the housing, including a valve seat, a supply channel in communication with a drain channel, a supply channel in communication with the chamber, magnetic means mounted on the valve housing and including a magnetic coil and a magnetic armature positioned in a positioning tube within the magnet coil, a valve plate having one end facing the valve seat, a valve shaft connecting another end of the valve plate to the armature and means sealing off the valve chamber from the interior of the positioning tube comprising an isolating diaphragm having an outer edge connected to the valve housing and an inner edge connected to the valve plate, the improvement wherein the valve seat has an inner circumference and a planar surface facing the valve plate and the valve seat has a sheet of polytetrafluoroethylene extending along the inner circumference thereof and coaxial with the axis of the valve shaft and projecting outwardly from the valve seat longitudinally on the side facing the valve plate beyond the surface of the valve seat to a preselected extent, with the surface of the edge of the sheet facing the valve plate situated in a sealing plane perpendicular to the axis of the valve shaft, wherein the valve plate is composed of a resilient material that is softer than the sheet, and wherein the surface of the valve plate that faces the valve seat is radically at an acute angle to the sealing plane at least at the points of contact.
1 Assignment
0 Petitions
Accused Products
Abstract
A solenoid valve, especially an outlet valve for infusion water. A valve chamber (2) is accommodated in a valve housing (1) and communicates with a supply channel (Z) and with a drain channel (A) by way of a valve seat (3). The magnetic armature (6) of a magnetic system accommodated on valve housing (1) is connected to a valve plate (10) accommodated in the valve chamber (2) opposite the valve seat (3). The valve chamber (2) is sealed off from the interior (11) of the magnetic system by an isolating diaphragm (12). To prevent calcium deposits, the valve seat (3) has a sheet (13) of polytetrafluoroethylene accommodated coaxially along its inner circumference and projecting beyond the surface of the valve seat (3) on the side facing the valve plate (10). The upper edge of the sheet (13) facing the valve plate (10) is in sealing plane with respect to the valve plate. The valve plate (10) consists of a resilient material that is softer than the sheet (13), and the surface that faces the valve seat (3) is radially at an acute angle to the sealing plane in the vicinity of the contact areas.
115 Citations
12 Claims
- 1. In a solenoid valve, having a valve housing, means forming a valve chamber in the housing, including a valve seat, a supply channel in communication with a drain channel, a supply channel in communication with the chamber, magnetic means mounted on the valve housing and including a magnetic coil and a magnetic armature positioned in a positioning tube within the magnet coil, a valve plate having one end facing the valve seat, a valve shaft connecting another end of the valve plate to the armature and means sealing off the valve chamber from the interior of the positioning tube comprising an isolating diaphragm having an outer edge connected to the valve housing and an inner edge connected to the valve plate, the improvement wherein the valve seat has an inner circumference and a planar surface facing the valve plate and the valve seat has a sheet of polytetrafluoroethylene extending along the inner circumference thereof and coaxial with the axis of the valve shaft and projecting outwardly from the valve seat longitudinally on the side facing the valve plate beyond the surface of the valve seat to a preselected extent, with the surface of the edge of the sheet facing the valve plate situated in a sealing plane perpendicular to the axis of the valve shaft, wherein the valve plate is composed of a resilient material that is softer than the sheet, and wherein the surface of the valve plate that faces the valve seat is radically at an acute angle to the sealing plane at least at the points of contact.
Specification