DE102012016428A1 - High-pressure valve for installation for high-pressure treatment of products in high-pressure chamber, has valve spindle tip whose end is sealed against conical surface of countersunk hole of valve seat - Google Patents

Abstract

The valve has a bore hole (8) inside a valve seat (4) through which a high-pressure medium flows from an inlet (2) to an outlet (3) when the valve is in open position. The valve seat is provided with a countersunk hole (10) having conical and shaft counter surfaces (13,15) in the direction of inlet and outlet valve seats (4a,4b). An end (11) of a valve spindle tip (6) is sealed against conical surface of countersunk hole of valve seat when the valve is in closed state. A shaft (12) of the valve spindle tip is made to form a gap with shaft counter surface of valve seat.

Description

The present invention relates to a high-pressure valve which has a valve spindle ( 5 ) and a related valve seat ( 4 ), which is used in a plant for high-pressure treatment of products.

In the high-pressure treatment, the products are treated in a high-pressure chamber, acted upon by a high-pressure medium, with a pressure of up to 10,000 bar. The high-pressure medium leaves the high-pressure chamber usually controlled by one or more high-pressure valves to a collecting container, where the high pressure medium is collected while the pressure in the high pressure chamber is reduced.

In some cases, the pressure is first reduced quickly to about 500 bar, then the pressure is slowly released to ambient pressure. This is also called quick and soft relaxation. The pressure reduction is accomplished by means of various pressure valves between the high pressure chamber and the collecting container.

In the case of rapid and soft release, the requirements for the pressure valves are different due to the different pressures and relaxation gradients.

The reduction of very high pressure differences in the fast voltage often leads to a very high flow dynamics associated with all possible flow erosion processes, such. B. cavitation, wall friction and wet steam erosion, the valve stem ( 5 ) and the valve seat ( 4 ), to damage. Therefore, it is desirable to find a solution to such a problem.

The reduction of the pressure in a high pressure chamber by means of two valves is in WO 2006/129180 A1 disclosed. In this case, a line with two pressure valves connected in series is provided for discharging the high pressure medium from the high pressure chamber. Between the two pressure valves is an intermediate pressure chamber for receiving the high pressure medium to gradually reduce the pressure from the first pressure valve to the second pressure valve and to prevent erosion of the pressure valve. The disadvantage, however, is that the clock cycles of this process are very long. In addition, carrying out the method with the pressure valves is expensive.

The font DE 10 2009 042 088 A1 describes an apparatus and a method for high pressure treatment of packaged food, wherein the pressure reduction takes place in a high pressure chamber in three phases. To operate the method, a number of different pressure valves is provided.

A separate construction of the high pressure valve is disclosed DE 44 38 462 C1 , which is a "soft tip" stud-needle valve designed for fluid systems up to about 1400 bar. The high pressure valve has a stuffing box with a pressure assist chamber disposed therein, a body having an inlet and an outlet, and a seat between the inlet and the outlet. A piston is arranged in the auxiliary pressure chamber. The stem has a lateral support with a soft stem tip and is drilled concentrically to connect the fluid pressure from the inlet to the top of the piston, whereby the piston moves the stem and the soft valve tip toward the valve seat and thus reduces and varies the actuating forces can be. The problem of erosion by highly dynamic flows is not addressed by this patent.

Due to the high total pressures and also the pressure differences only valve spindles and seats made of high-strength materials can be used in the working range up to 10000 bar aimed here.

To remedy the present problem, one would automatically try to use a harder material for the valve stem and valve seat. Although this leads to an improved result compared to softer materials. But due to the erosion load on each relaxation cycle, which causes the high-pressure medium as it flows through the valve stem and valve seats, frequent replacement of the components is still unavoidable.

Avoiding the critical high-dynamic flow states can be achieved by upstream and / or downstream flow resistance, but the relaxation rate is greatly reduced. However, this is undesirable in time-critical applications.

In the construction of a high-pressure valve, in particular the valve spindle and the valve seat, with respect to the material pairings used and also the shape of the components must be coordinated.

The invention is therefore based on the problem to provide a structurally simple high pressure valve in the high pressure treatment of products up to 10000 bar pressure available, whereby a higher number of wear cycles is achieved.

• • einen Ventilkörper (1) mit einem Einlass (2) und einem Auslass (3),
• • einen Ventilsitz (4) zwischen dem Einlass (2) und Auslass (3), und
• • eine Bohrung (8) innerhalb des Ventilsitzes (4), wodurch das Hochdruckmedium bei der Offenstellung des Hochdruckventils vom Einlass (2) bis zum Auslass (3) strömt,
• • eine Ventilspindel (5), wobei die Ventilspindelspitze (6) durch einen Teil der Ventilspindel (5) ausgebildet ist, und
• • die Ventilspindelspitze (6) den Ventilsitz (4) im geschlossenen Zustand des Hochdruckventils abdichtet,
• • wobei der Ventilspindelspitze (6) ein kegelförmiges Ende (11) und einen zylindrischen Schaft (12) aufweist,
• • der Ventilsitz (4) der Ventilspindelspitze (6) zugewandten Seite eine konzentrische, zylindrische Senkbohrung (10) mit einer sich konzentrischen verjüngenden Form aufweist, und
• • sich eine Bohrung (8) an der konzentrischen verjüngenden Form innerhalb des Ventilsitzes (4) bis zum Einlass (2) des Ventilsitzes (4) erstreckt, und
• • wobei die Ventilspindelspitze (6) die konische Fläche (13) der zylindrischen Senkbohrung des Ventilsitzes (10) bis in die Bohrung (8) des Ventilsitzes (4) hinein im geschlossenen Zustand des Hochdruckventils abdichtet.

The object is achieved by a high pressure valve for a plant for high pressure treatment of Products with a pressure of up to 10000 bar, comprising

• A valve body ( 1 ) with an inlet ( 2 ) and an outlet ( 3 )
• A valve seat ( 4 ) between the inlet ( 2 ) and outlet ( 3 ), and
• • a hole ( 8th ) within the valve seat ( 4 ), whereby the high-pressure medium in the open position of the high-pressure valve from the inlet ( 2 ) to the outlet ( 3 ) flows,
• • a valve stem ( 5 ), wherein the valve stem tip ( 6 ) by a part of the valve spindle ( 5 ), and
• • the valve stem tip ( 6 ) the valve seat ( 4 ) seals in the closed state of the high pressure valve,
• • whereby the valve spindle tip ( 6 ) a conical end ( 11 ) and a cylindrical shaft ( 12 ) having,
• • the valve seat ( 4 ) of the valve stem tip ( 6 ) facing side a concentric, cylindrical counterbore ( 10 ) having a concentric tapered shape, and
• • a hole ( 8th ) at the concentric tapered shape within the valve seat ( 4 ) to the inlet ( 2 ) of the valve seat ( 4 ), and
• • where the valve stem tip ( 6 ) the conical surface ( 13 ) of the cylindrical counterbore of the valve seat ( 10 ) into the hole ( 8th ) of the valve seat ( 4 ) in the closed state of the high pressure valve seals.

In order for the high-pressure valve to seal well when closed, the contact surface at which the conical end ( 11 ) of the valve stem tip ( 6 ) and the conical surface ( 13 ) of the cylindrical counterbore ( 10 ) of the valve seat ( 4 ) are optimally tuned. The tip of the cone-shaped end ( 11 ) of the valve stem tip ( 6 ) protrudes into the hole ( 8th ) of the valve seat ( 4 ) into it.

During opening of the high-pressure valve, a distinction must be made between different states of relaxation that merge into each other. First, the pressure reduction takes place in the gap between the valve spindle tip ( 6 ) and the conical surface of the cylindrical counterbore ( 13 ), then through the gap between the stem of the valve stem tip ( 12 ) and the cylindrical counterbore of the valve seat ( 10 ). With a further increasing opening path, the pressure reduction takes place only in an increasing manner in the gap between the shaft of the valve spindle tip ( 12 ) and the cylindrical counterbore of the valve seat ( 12 ). When completely from the counterbore of the valve seat ( 9 ) extended valve stem tip ( 6 ) adjust the valve seat ( 4 ) and valve stem tip ( 6 ) no relevant flow resistance. The pressure reduction takes place only in the supply and discharge line system.

The cylindrical part of the counterbore ( 10 ) of the valve seat ( 4 ) may be formed as a cone with an angle up to 6 ° to adjust the gap flow to the requirements. Since the valve seat ( 4 ) and the valve stem tip ( 6 ) form a cooperating unit of the high-pressure valve, and the cylindrical shaft of the valve stem tip ( 12 ) also have an adapted cone with an angle of up to 6 °.

In addition, lateral holes ( 9 ) in the valve seat ( 4 ) are introduced to optimally adjust the flow resistance of the valve seat-valve stem combination.

The head part of the valve stem ( 5 ) is through the valve stem tip ( 6 ) educated. Since a high demand on the head part of the valve stem ( 5 ), namely the valve spindle tip ( 6 ), and z. B. the valve stem tip ( 6 ) of a different material than the valve stem ( 5 ), it is advantageous that the valve spindle ( 5 ) and the valve stem tip ( 6 ) can not be made together as one part. This can be done so that the valve stem ( 5 ) has an inner bore, wherein the cylindrical shaft ( 12 ) of the valve stem tip ( 6 ) is recorded.

With regard to the high demand on the high-pressure valve, the valve seat ( 4 ) and the valve stem tip ( 6 ) are generally made of high strength materials such as metal alloys.

The high pressure valve can consist of valve seat ( 4 ) and valve stem ( 5 ), Have a control device, with which it is regulated.

Of course, the control device is controllable both manually and by machine.

The valve body ( 1 ) and the valve seat ( 4 ) form a valve chamber, in which is a valve chamber protection ( 14 ) intended. The valve chamber protection ( 14 ) protects the inner surface of the valve chamber from erosion. If the valve chamber protection ( 14 ) he can quickly and easily in place of the valve body ( 1 ) be replaced.

The parts according to the invention are illustrated by the following drawings.

1 represents a high pressure valve.

2 shows an embodiment of the valve seat ( 4 ).

3 illustrates an embodiment of the valve stem tip ( 6 ).

In 1 there is illustrated a high pressure valve comprising a valve body ( 1 ) having. The valve body ( 1 ) has a valve stem ( 5 ) with valve stem tip ( 6 ), a related valve seat ( 4 ) and an inlet ( 2 ) and outlet ( 3 ) on. The valve seat ( 4 ) is between the inlet ( 2 ) and the outlet ( 3 ) arranged. Through the inlet ( 2 ), the high pressure medium leaving the high pressure chamber flows into the bore ( 8th ) of the valve seat ( 4 ) along. The valve stem tip ( 6 ) has a conical end ( 11 ) and a cylindrical shaft ( 12 ), and the valve stem ( 5 ) has an inner bore, wherein the cylindrical shaft ( 12 ) of the valve stem tip ( 6 ) is recorded. The position of the valve stem ( 5 ) is powered by a drive ( 7 ) is mounted, accomplished.

So that the valve seat ( 4 ) and the valve stem tip ( 6 ) seal optimally in the closed state of the high-pressure valve, the conical surface of the valve seat ( 13 ) an axial deviation α of about 45 ° and the conical end ( 11 ) of the valve stem tip ( 6 ) an axial deviation of about 43.5 °. The valve spindle ( 5 ) together with the valve spindle tip ( 6 ) is by means of the drive from the valve seat ( 4 ), the high-pressure medium flows between the valve seat ( 4 ) and the valve stem tip ( 6 ) in the direction of the outlet ( 3 ). Valve body ( 1 ) and valve seat ( 4 ) form a so-called valve chamber. The inner surface of the valve chamber can additionally be replaced by a valve chamber protection ( 14 ) are protected from erosion.

Experiments have shown that can be achieved with the above-described high-pressure valve according to the invention in the high-pressure treatment of products up to 10,000 bar over 5000 cycles / wear cycle number.

2 is a detailed representation of the valve seat ( 4 ). For economic reasons, the valve seat ( 4 ) consist of several parts, which are mounted in each other. Several lateral holes ( 9 ) are in the cylindrical counterbore of the valve seat ( 10 ) appropriate. Ideally, side holes ( 9 ) on the transition from the conical surface ( 13 ) to the cylindrical side wall of the counterbore ( 10 ) arranged.

3 shows a possible execution option of the valve stem tip ( 6 ), here the conical end ( 11 ) of the valve stem tip ( 6 ) a smaller axial deviation compared to the conical surface to be sealed ( 13 ) of the valve seat ( 4 ), so that the conical end ( 11 ) of the valve stem tip ( 6 ) of the conical surface ( 13 ) of the valve seat ( 4 ) optimally seals under high pressure.

LIST OF REFERENCE NUMBERS

1

valve body

2

inlet

3

outlet

4

valve seat

5

Valve stem

6

Valve stem tip

7

Drive from here

8th

drilling

9

Lateral hole

10

Cylindrical counterbore of the valve seat

11

Tapered end of valve stem tip

12

Cylindrical shaft of the valve stem tip

13

Conical surface of the cylindrical counterbore

14

Valve chamber protection

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2006/129180 A1 [0006]
• DE 102009042088 A1 [0007]
• DE 4438462 C1 [0008]

Claims (9)

High-pressure valve for a system for high-pressure treatment of products with a pressure of up to 10000 bar, comprising • a valve body ( 1 ) with an inlet ( 2 ) and an outlet ( 3 ), • a valve seat ( 4 ) between the inlet ( 2 ) and outlet ( 3 ), and • a bore ( 8th ) within the valve seat ( 4 ), whereby the high-pressure medium in the open position of the high-pressure valve from the inlet ( 2 ) to the outlet ( 3 ) flows, • a valve stem ( 5 ), wherein the valve stem tip ( 6 ) by a part of the valve spindle ( 5 ), and • the valve spindle tip ( 6 ) the valve seat ( 4 ) seals in the closed state of the high-pressure valve, characterized in that • the valve spindle tip ( 6 ) a conical end ( 11 ) and a cylindrical shaft ( 12 ), • the valve seat ( 4 ) of the valve stem tip ( 6 ) facing side a concentric, cylindrical counterbore ( 10 ) having a concentric tapered shape, and 8th ) at the concentric tapered shape within the valve seat ( 4 ) to the inlet ( 2 ) of the valve seat ( 4 ), and wherein the valve stem tip ( 6 ) the conical surface ( 13 ) of the cylindrical counterbore of the valve seat ( 10 ) into the hole ( 8th ) of the valve seat ( 4 ) in the closed state of the high pressure valve seals. High-pressure valve according to claim 1, characterized in that the cylindrical part of the counterbore ( 10 ) of the valve seat ( 4 ) is designed as a cone with an angle up to 6 °. High-pressure valve according to claim 1 or 2, characterized in that the cylindrical shaft ( 12 ) of the valve stem tip ( 6 ) has a cone with an angle of up to 6 °. High-pressure valve according to claim 3, characterized in that the valve seat ( 4 ) in the cylindrical counterbore ( 10 ) lateral holes ( 9 ) having. High-pressure valve according to claim 3, characterized in that the head part of the valve spindle ( 5 ) through the valve stem tip ( 6 ) is trained. High-pressure valve according to claim 5, characterized in that the valve spindle ( 5 ) has an inner bore, wherein the cylindrical shaft ( 12 ) of the valve stem tip ( 6 ) is recorded. High-pressure valve according to one of the preceding claims, characterized in that the high-pressure valve has a control device, whereby it is regulated. High-pressure valve according to claim 7, characterized in that the control device is controlled both manually and by machine. High-pressure valve according to one of the preceding claims, characterized in that the valve body ( 1 ) and the valve seat ( 4 ) form a valve chamber in which a valve chamber protection ( 14 ) is provided.

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