DE10055342A1 - Check valve for hydraulic fluids - Google Patents

Abstract

Large nominal sizes in hydraulic systems, especially in connection with high pressures, lead to large actuation forces for check valves. These can often no longer be applied by hand. The provision of additional forms of energy - e.g. B. electrical or pneumatic energy - is complex in hydraulic systems and associated with high costs. DOLLAR A To enable the manual actuation of a check valve in a hydraulic system with lines of larger nominal width, the present hydraulic pressure is used by the invention. DOLLAR A The invention relates to a 2/2-way shut-off valve for hydraulic fluids in industrial systems. is suitable for larger nominal widths and high pressures and DOLLAR A - has no non-hydraulic energy supply. DOLLAR A The check valve is particularly suitable for use in hydraulic systems with lines of larger nominal width and high pressures.

Description

The invention relates to a check valve as a 2/2-way valve for hydraulic fluids Use in industrial plants. Hydraulic fluids are preferred in Form of emulsions as oil-in-water emulsions or water-in-oil emulsions in hydraulic technology under the known high working pressures in industrial Plants, such as those used in underground mining.

The basic requirements for a reliable shut-off valve in industrial plants are:

• - Manually operated by a handle without tools
• - Insensitive to pressure fluctuations or pressure surges in order not to get into uncontrolled interventions of the switch positions.

In industrial plants, there are specific product-related relationships; for example, in hydraulic systems of underground mining, it is essential to ensure reliable actuation of a check valve. This is among the known high pressures of mining facilities and mining operations Conditions such as temperature, dust, aggressive water, etc. difficult. This has to do with that performed that by using other forms of energy on the valve, such as. B. electrical or pneumatic energy, auxiliary energy must be kept available for actuation gene or to move to the desired switch position.

A tap is known from DE 197 28 234 A1, comprising a housing and a housing therein rotatable chick, the chick having a shaft with a cavity into which at least one opening arranged on the jacket side of the shaft opens, and that on the shaft at least two elastic, ring-shaped enclosing the shaft Has sealing members, between which the at least one jacket-side opening is arranged and which has at least one further sealing member on the shaft, which encloses at least one opening.  

With such a design is only through a tight fit between Housing and plug with a correspondingly large contact force between the parts Liquid sealing causes.

Larger fit forces inevitably mean that when the chick is turned twisting rotational friction large and both parts of the tap are under relatively high me chanic tension. In particular, there are roundnesses on one of the pas solution to small gaps between the chick and the housing, which is especially high pressures and low viscosity of the working fluid due to leaks at the tap manifests.

DE 197 15 239 A1 describes the process control of liquid or gaseous Media under high pressure. According to this, an electric motor should be used the one that has a cam disc that turns the rotary motion of the electric motor into a translatory movement, actuated a valve lifter. This arrangement is said to ensure that the large actuating forces present at high pressure are reliable overcome and that if the power supply fails, a defined idle state of the Facility is ensured.

The use of an additional, e.g. B. non-hydraulic energy form for actuation of valves, however, leads to a larger mechanical and related costly effort. Furthermore, the system is more complicated, too leads to a reduction in their availability, since security-related An such as are often used in mining, even in the event of a failure the non-hydraulic form of energy must be switched off.

The invention has for its object a manual actuation of a lock valve on hydraulic equipment of industrial plants even with larger nominal wide, if possible without auxiliary equipment and without further non-hydraulic Forms of energy that would only complicate the valve design.

The object is achieved by a device arranged in the check valve according to the characterizing part of claim 1 in connection with an externally on the check valve arranged pilot valve of conventional design.  

According to claim 1 and an embodiment according to FIGS. 1 and 2, this purpose is achieved by the fact that the hydraulic pressure present in the system after actuation of a pilot valve in an annular space 23 on the sealing element 02, whose area is larger than that which the sealing element 02 presses the switch plug 01, is directed. Due to the resulting forces, the outer annular surface 25 of the sealing element 02 is moved into the gap, which measures at least 0.2 mm, towards the cover 05 and the sealing element 02 is lifted off from the switch plug 01 due to its dome-shaped design. As a result, the frictional force between switch plug 01 and sealing element 02 is reduced or completely eliminated and the shut-off valve can now be switched by hand without great effort.

LIST OF REFERENCE NUMBERS

01 switch plug
02 sealing elements
03 guide sleeve
04 housing
05 cover

20

inner ring surface

23

annulus

25

outer ring surface

31

drilling

Claims (2)

1. 2/2-way valve for blocking a fluid flow in a pipeline or a hose of the hydraulics of industrial systems, the blocking body being designed as a rotary valve in the form of a spherical switching plug, which is arranged so as to be rotatable about its axis perpendicular to the direction of flow, a cylindrical transverse bore with which, depending on the position of the switch plug, it completely releases or blocks the flow through a lenticular or circular cross-section corresponding to the line cross-section, characterized in that
that between the switching plug (01), cover (05) and housing (04) a guide sleeve (03) for a sealing element (02) is rigidly arranged,
that on one or both sides of the switch plug (01), aligned in the flow direction, an axially displaceable sealing element (02) is arranged, the sen chick-side end face being shaped like a dome and adapted as a sealing surface to the spatial switch plug geometry and the cover-side end face in two axially Staggered circular ring surfaces is divided, the inner circular ring surface ( 20 ) having a terminal, in the flow direction free end face, behind which there is a space and the outer circular ring surface ( 25 ), the chick-side lid end face NEAR, one of these at least 0.2 mm wide Gap and with its chick-side counter ring surface forms a shoulder which, together with the counter surface of the guide sleeve (03), forms a closed annular space ( 23 ) which has connection channels to the pilot valve outlet via one or more bores ( 31 ) in the guide sleeve (03). 2. 2/2-way valve for blocking a fluid flow in a pipeline or a hose of the hydraulics of industrial plants, according to claim 1, characterized in that in the space between the cover (05) and the inner annular surface ( 20 ) a Fe arranged is.