DE202004001877U1 - Fluid pressure reducing valve has a set spring operating against a sliding piston that has a ring seal - Google Patents

Abstract

The fluid pressure reducing valve has a main block with an inlet [4] and an outlet port [5]. The flow connection is made by displacing a valve element [8] that responds to the difference in force caused by the fluid pressure on one side and a spring [7] on the other. The spring operates against a piston [6] that is sealed [12].

Description

Pressure reducers with membranes as sealing elements are well known. For example, in EP0 233 604 B1 described a pressure regulator with a membrane. However, the pressure and flow fluctuations occurring in such pressure regulators place a heavy load on the membrane, which limits the service life. In addition, membranes are usually expensive.

DE 94 09 582 U1 describes a pressure reducer without membranes. The disadvantage here is the complex design and the large number of seals required. In particular, the sealing point, which is formed by a closing body, a bevel, an outer closing edge and a rubber ring valve seat, requires high demands on precision and sealing material in order to guarantee functional reliability.

Object of the present invention it is therefore to propose a pressure reducer of the type mentioned at the beginning, which is simple and therefore inexpensive, as well as high Has functional reliability and with the help of the aforementioned Disadvantages can be avoided.

This task is surprising according to the invention simply solved by that the piston is provided with a combined sliding and sealing element is. With the help of this sliding and sealing element, the piston is relative to the housing movable, with a seal between the piston and housing at the same time is.

The use of such a combined sliding and sealing element enables a large piston stroke with constant effective area. This makes it possible a constant hold pressure within a large flow range achieve, whereas the otherwise usual Diaphragms vary depending on the flow and the piston stroke associated with it to be greatly stretched. With the pressure reducer according to the invention Elongation of the membrane and thus a change in the effective area of the membrane and with it a change of reprint avoided. In contrast, known pressure reducers due to the mechanical stress on the membrane with a reduced Life expectancy.

In a preferred embodiment there is the combined sliding and Sealing element made of two concentric rings that are tight on the piston issue. Sealing ring and slide ring can thus be manufactured individually at low cost.

In another variant, the Sealing ring firmly connected to the slide ring. This variant is Although more expensive to manufacture, it allows an easier one Assembly and closes an unintentional displacement of the sealing ring and slide ring to each other.

The use of is particularly advantageous Teflon as a sliding ring and a commercially available O-ring as a sealing ring. Thanks to the excellent sliding properties of Teflon and the high elasticity and the resulting good sealing function of a commercial, inexpensive O-Rings gives that Combining these two materials creates a seal with excellent Sliding properties.

In a particularly preferred variant is the piston with a valve body connected with integrated seal. In this embodiment, the valve closes if not allowed high pre-pressure safely by the valve body with its seal (e.g. O-ring) is pressed tightly against the valve seat.

With a technically particularly simple feasible embodiment the spring has a predetermined, non-adjustable spring force. The use of such a spring is possible because in the most common make only a limited, predetermined reprint is required. In this embodiment can on an opening on the housing for the Inclusion of an adjustment device can be dispensed with. Advantageous This variant is in addition to the simple and therefore inexpensive Design the fact that even with leaks in the piston none Water to the outside can penetrate. This is particularly important in rooms where there is great water damage can.

However, the pressure reducer according to the invention can can also be realized in such a way that the force of the spring is adjustable is. In this case the reprint can be arbitrary.

Another variant is on Housing Valve for leakage and function control of the pressure regulator provided. Here can be checked from time to time by briefly opening the valve whether there is water in the area due to a leak in the piston the spring is located and the function of the pressure reducer is disturbed.

Further advantages of the invention result itself from the description and the drawing. Likewise, the the above-mentioned and the features listed further according to the invention individually for themselves or more than one can be used in any combination. The embodiments shown and described are not as final enumeration to understand, but rather have exemplary character for the description the invention. The invention is shown in the drawing and is based on an embodiment explained in more detail.

Show it:

1 a schematic vertical section through an embodiment of the device according to the invention in the closed position (no flow), and

2 a schematic vertical section through an embodiment of the device according to the invention during water withdrawal.

The pressure reducer consists of an upper part of the housing 1 and a junction box 2 , the via a flange seal 3 are closely connected. In the connection housing 2 there is an inflow 4 and a spout 5 ,

In phases in which no water is drawn off ( 1 ), exceeds the force caused by the pressure of the water on the ring surface of the piston 6 is exerted the force of the spring 7 , The piston 6 moves upwards and with it the valve body 8th , The seal presses 9 against the valve seat 10 , The valve is closed.

With water withdrawal ( 2 ) reduces the pressure and thus the force caused by the pressure on the ring surface of the piston 6 is exercised. The piston 6 moves by the force of the spring 7 down until the forces are balanced, the closing body 8th will be opened. The sliding element 11 enables low-friction piston movement relative to the housing 1 , the sealing element 12 due to its elasticity ensures that the piston 6 always close to the housing 1 closes. The opening 13 on the housing 1 can accommodate an adjusting device for the force of the spring 7 or serve for leakage control.

Claims (8)

Pressure reducer for use in domestic drinking water installations, which has a housing ( 1 . 2 ) with an inflow ( 4 ) and an outlet ( 5 ) and a piston ( 6 ) with a spring ( 7 ), characterized in that the piston ( 6 ) with a combined sliding and sealing element ( 11 . 12 ) is provided. Pressure reducer according to claim 1, characterized in that the combined sliding and sealing element ( 11 . 12 ) of two close to the piston ( 6 ) adjacent concentric rings. Pressure reducer according to claim 2, characterized in that the sealing ring ( 12 ) firmly with the slide ring ( 11 ) connected is. Pressure reducer according to one of claims 2 or 3, characterized in that the sliding ring ( 11 ) is made of Teflon and the sealing ring ( 12 ) is a commercially available O-ring. Pressure reducer according to one of the preceding claims, characterized in that the piston ( 6 ) with a valve body ( 8th ) with integrated seal ( 9 ) connected is. Pressure reducer according to one of the preceding claims, characterized in that the spring ( 7 ) has a predetermined, non-adjustable spring force. Pressure reducer according to one of claims 1 to 5, characterized in that the force of the spring ( 7 ) is adjustable Pressure reducer according to one of the preceding claims, characterized in that on the housing ( 1 ) a valve ( 13 ) is provided for leakage and function control.