JPH0143873B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a valve housing having a first valve seat and a second valve seat, a closed position in contact with the first valve seat and a first valve housing in a closed position contacting the first valve seat.
a first valve body housed in a valve housing capable of achieving movement between an open position and a significant distance from the valve seat;
A second valve body accommodated in the valve housing, capable of achieving movement between a closed position in contact with the second valve seat and an open position largely moved away from the second valve seat; one adjustment rod, a second adjustment rod fixed to the second valve body, and operatively coupled to the first adjustment rod and the second adjustment rod to adjust the movement of the first valve body and the second adjustment rod. The present invention relates to a two-seat valve with a control head for achieving movement.

When a double-seat valve of this type is adopted in the beverage industry, it is required that the valve be able to accomplish, among other tasks, automatic purification of the product flow path. In this regard, program-controlled chemical purification methods are known, which allow remote control to be introduced into the purification process. In the double-seat valve incorporated in this,
The mutually movable valve bodies form a hollow space, to which a leakage liquid channel is connected, which leads to the outside at its end remote from the valve seat. With this valve, non-sealing in the valve seat or the like can be quickly detected and removed based on the flow of leaking liquid before further damage occurs. In addition to this requirement, double seat valves allow for relatively easy and reliable purification.
In addition, all fluid passages, including the seating surfaces of both valve discs that are not facing the hollow space, must be designed in such a way that they can be microbiologically purified, with the common Both general and individual purification follow the corresponding programmed course.
must be carried out.

To meet this requirement, in double-seat valves, in addition to the actual control head for moving the valve discs into the closed and open positions, a separate adjusting device is required to achieve a slight opening movement of each valve disc. must be deployed. Particularly in the case of completely upwardly projecting valve discs, a considerable practical difficulty is involved in that the lower valve disc must be equipped with an additional device for a slight opening movement. The device for the opening movement, which is thereby installed below the actual valve housing, significantly increases the construction height of this type of valve, so that none of the conventional solutions satisfactorily meets the requirements. It's not a thing.

Therefore, the purpose of this invention is to provide both valve bodies of a two-seat valve,
The purpose is to enable these valve bodies to operate independently from above using a common control cylinder.

To achieve this objective, the invention provides that the first adjusting rod and the second adjusting rod both pass through a control head and reach a control cylinder, and the control cylinder moves the first piston and the second piston. the first piston is movable along the axis in a first direction and a second direction opposite thereto, and when moved in the first direction, contacts the first adjustment rod and controls the first valve. the first adjusting rod is moved to move the body from its closed position, but in a floating state such that when the first valve body moves slightly, movement of the first piston is prevented by the stop; The second piston is attached to the first adjustment rod at a position where the second piston is movable along its axis in a first direction and a second direction opposite thereto, and comes into contact with the second adjustment rod when moved in the first direction. and moves the second adjustment rod to move the second valve body from its closed position, but when the second valve body moves slightly, movement of the second piston is prevented by the stop. It is attached to the second adjustment rod in a floating state.

According to the solution proposed in this invention, the drawbacks mentioned above are avoided. Due to the attachment of a common control cylinder to both valve bodies, it is possible to attach it above the actual control head as the main regulator.
This can be achieved in a simple manner, only requiring the adjustment rod to be lengthened. All other components of the two-seat valve are conventional and do not need to be prepared separately. Significant advantages compared to previously known devices can thereby be obtained in a very simple manner, especially in the production and operation of double-seat valves of this type.

Embodiments of the present invention will be described in detail below with reference to the drawings.

A control head 1 as master regulator serves to actuate valve bodies 3, 4 arranged in a valve housing 2. The master regulator therefore has an actual control head 1 and a piston 5 guided therein, which is connected to the articulating rod 6 of the upper valve body 3 and which, when pressure is applied, Move the valve body 3 from its valve seat to the open position. A further adjusting rod 7 is installed in this adjusting rod 6, which controls the lower valve body 4.
connected to. Inside the control head 1, a compression spring 9 is present in the housing 8, which presses the lower valve body 4 against its valve seat and which presses both valve bodies 3,
4 serves to press the lower valve body 4 against the valve body 3. Another compression spring 25 rests on the underside of the piston 5 at one end and on the control head 1 at the other end.
touches the inner surface of According to this, the piston 5 is
When not operated with compressed air, it is held in its upper position, that is, in the position where the valve bodies 3, 4 are closed.

Above the main regulator there is a further control cylinder 10 whose role is to move the valve bodies 3, 4, individually or together, slightly open from their valve seats for cleaning purposes. There is a particular thing. For this purpose, the adjusting rods 6, 7 extend upwards from the control head 1 and end in the area of the control cylinder 10. Each adjustment rod 6, 7 is
The piston 11, 1 is installed in a floating state on this
2 is attached. The pistons 11 and 12 are arranged so that they can vertically move up and down along their respective axes, and when they move downward, the adjustment rods 6 and 7
The adjustment rods 6 and 7 are moved in such a direction that the valve bodies 3 and 4 are brought into contact with each other to open the valve bodies 3 and 4, respectively. For this purpose, the piston 11 is provided with a surface that can come into contact with the upper end of the adjustment rod 6. In the area penetrated by the adjusting rod 6, there is an externally adjustable and lockable adjusting ring 14 as a stop, with which the maximum stroke of the lower piston 11 is adjusted to achieve a slight opening movement of the valve body 3. limited to.

At its upper end, the adjusting rod 7 receives an adjusting sleeve 16 with a threaded section 15, which contacts a flange 17 of the sleeve 16 when the second piston 15 moves downwards. By adjusting the degree of threaded engagement of the adjustment sleeve 16, this
its axial position relative to the adjustment rod 7 can be changed;
Thereby, the stroke of the piston 12 can be adjusted in a simple manner. In this case, in order to achieve a slight opening movement of the valve body 4, the maximum downward movement of the piston 12 is limited by a stop surface 18 inside the control cylinder 10, which is designed as a stop.
Separation of the cylinder 10 between both pistons is not necessary. The upper piston chamber 19 has an air connection port 20
The lower piston chamber 21 is likewise fitted with another air connection 22 .

When purification of the valve seat surface, the valve body and the hollow space between the valve body is to be achieved on the basis of a predetermined program selection, the piston 12 is activated, for example by applying compressed air to the piston chamber 19. is moved axially downwards against the flange 17, whereby, via the adjusting rod 7, the valve body 4 is moved slightly open from its seat to the maximum piston stroke. In this state, if purifying liquid is allowed to flow into the lower passage of the valve housing 2, it will pass through the gap between the valve body 4 and its valve seat and be introduced into the hollow space 23 formed by both valve bodies. It is guided to the outside through the passageway 24. At this time, there is no problem even if the product liquid is flowing in the passage above the valve housing 2, and since the valve body 3 is in the closed position, there is no fear that the purifying liquid will mix into the product liquid.

A corresponding individual cleaning of the valve body 3 and its valve seat is also possible, in which case the piston chamber 2
Compressed air is applied only to 1. In this case,
Only the valve body 3 opens and moves slightly, and the valve housing 2
When the purifying liquid is introduced into the upper passage, it passes through the gap between the valve body 3 and its valve seat, is guided into the hollow space 23, and is led to the outside through the passage 24. At this time, there is no problem even if the product liquid flows into the lower passage of the valve housing 2. However, if it is desired to open and move both valve bodies from their valve seats at the same time, this can also be achieved.

As is clear from the above, the construction height of a double-seat valve of this type is kept significantly smaller.

[Brief explanation of drawings]

The drawing is a diagrammatic vertical section through an embodiment of the control head according to the invention. In the drawing, 1 is a control head, 2 is a valve housing, 3 and 4 are valve bodies, 6 and 7 are adjustment rods, 10 is a control cylinder, 11 and 12 are pistons, 14 and 18
indicates a stop.

Claims (1)

[Claims] 1. A valve housing 2 having a first valve seat and a second valve seat, which allows movement between a closed position in which it contacts the first valve seat and an open position in which it is largely separated from the first valve seat. The first valve body 3 accommodated in the valve housing 2 can achieve a movement between a closed position in which the first valve body 3 is in contact with the second valve seat and an open position in which it is largely moved away from the second valve seat. The second valve body 4 accommodated, the first adjustment rod 6 fixed to the first valve body 3, the second adjustment rod 7 fixed to the second valve body 4, and the first adjustment rod 6 and the second adjustment rod A two-seat valve comprising a control head 1 operatively connected to a rod 7 for effecting said movement of the first valve body 3 and said movement of the second valve body 4, comprising: a first adjusting rod 6 and a second valve body 4; The adjusting rods 7 both pass through the control head 1 and arrive at a control cylinder 10, which receives a first piston 11 and a second piston 12, and which contains a first piston 11 and a second piston 12.
is a first direction along its axis and a second direction opposite to this.
When moving in the first direction,
The first adjusting rod 6 is moved so as to contact the first adjusting rod 6 and move the first valve body 3 from its closed position, but when the first valve body 3 moves slightly, the first adjusting rod 6
The second piston 12 is attached to the first adjusting rod 6 in a floating manner so that the movement of the piston 11 is prevented by a stop 14, and the second piston 12 is attached to the first adjusting rod 6 along its axis.
direction and a second direction opposite to this, and when it moves in the first direction, it contacts the second adjustment rod 7,
The second adjustment rod 7 is moved to move the second valve body 4 from its closed position, but when the second valve body 4 moves slightly, the movement of the second piston 12 is blocked by the stop 18. A two-seat valve, characterized in that it is attached to the second adjustment rod 7 in a floating state, as shown in FIG.