Burkert Werke Gmbh & Co.

B Urkert Gmbh

Heinrich Dettmann

Ernst Uhl

Otto Mehrer

Wolfgang Pfeiffer

A fluid control element comprises a housing in which two control chambers are formed, which are isolated from each other and comprise a working port each as well as two pressure ports. Two of these ports are provided with a sealing seat each. The fluid control element further comprises a switching element movably mounted in said housing and comprising a sealing part in each control chamber. The sealing part cooperates with the sealing seats such that these are opened or closed. The fluid control element further comprises an actuating member for the switching element, the actuating member being able to bring the switching element into three positions.

Fluid control element

A module comprises a pilot valve and four switching valves, in particular for driving actuators, the pilot valve being a 4/3-way valve.

Module for driving actuators

Miniaturized magnetic valve

A valve combination is proposed for use in plumbing applications which is suitable as a replacement for conventional solenoid valves with a plunger armature. The valve combination consists of a main valve (10), embodied as a diaphragm valve, a servo valve (14) integrated into a cable connector head (12), and a fluidic coupling (16) between the cable connector head (12) and the main valve (10). The cable connector head (12) is provided with an electrical quick connector (18).

Valve combination

A magnetically operated valve having a permanent magnet with constant remanence wherein the permanent magnet is formed with an annular configuration and is located in one end of a tubular core guide member which operates to guide a movable core member forming the valve body. The permanent magnet is produced from a rare earth/cobalt alloy and secures the valve in at least one of a plurality of switched positions and a ferromagnetic circuit is formed with sheet metal sheets extending to form the outer portion of the ferromagnetic circuit with the movable core member forming the inner part thereof. The permanent magnet is inserted in cutout portions of the sheet metal sheets which form the outer part of the ferromagnetic circuit.

Pulsed magnetic valve assembly

The magnetic valve with electronic control for increasing the attractive output has an energizing coil (AE), which is supplied in the attracting phase with an increased energizing current via a closed switch (T2). In the maintenance phase, the energizing coil (AE) is supplied with a maintenance current, via a compensating resistor (RV) and with the switch (T2) opened, which is lower than the energizing current. For the purpose of controlling the switch (T2), a timing circuit is provided which includes a resistor (R2) and a capacitor (C2). The magnetic valve is selectively drivable with alternating current or direct current. A portion of the energizing coil (AE) is made up of the compensating resistor (RV), which is embodied as a resistor wire and wound up on the energizing coil (AE).

Magnetic valve with electronic control

There is provided a control valve arrangement for dental equipment which comprises a plurality of modular type assemblies having at least three functional zones with the modules including inter-connecting passageways and disposed so as to handle a plurality of separately controlled pressurized media. Provision is also made to rotate a particular module about an X axis to modify the operation of that module.

Control valve arrangement for dental equipment

Plastic seals for use in valves which handle chemically reactive and aggressive media are described. These seals have a base layer made from porous PTFE and a covering layer of smooth, dense PTFE. The two layers are suitably sintered together. The seal is held in a seal holder which may be injection molded around the seal and may be made from a similar material. During the production of the base layer, the PTFE material is mixed with a flushable filler material which leaves a structure of pores in the layer after removal. These pores impart to the base layer an elastic property. A method for joining the seal to the seal carrier and a method for forming annular seals are also described.

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Niedernhall, Germany

Heinrich Dettmann