Drive for Switching a Double Seat Valve

• US 20140311600A1
• Filed: 11/28/2012
• Published: 10/23/2014
• Est. Priority Date: 12/03/2011
• Status: Active Grant

• Current Assignee: Gea Tuchenhagen Gmbh (GEA Group AG)
• Original Assignee: Gea Tuchenhagen Gmbh (GEA Group AG)
• Inventors: Burmester, Jens
• Granted Patent: US 9,423,035 B2
• Time in Patent Office: Days
• US Class Current: 137/614.18
• CPC Class Codes: F16K 1/446 with additional cleaning or venting means between the two seats
• CPC Class Codes: F16K 31/1225 with a plurality of pistons
• CPC Class Codes: Y10T 137/87917 Flow path with serial valves and/or closures
• CPC Class Codes: Y10T 137/88038 One valve head carries other valve head

Abstract

A double set valve capable of seat cleaning has a drive and control unit integrated together. The drive switches the valve, and includes two closing elements moveable independently of each other and enclose a leakage cavity.

Claims

1. A double seat valve having a drive (70) for switching the valve, having two closing elements (3, 4) that are movable independently of each other, which between themselves enclose a leakage cavity (5) that is connected to the surrounding area of the double seat valve (1), wherein the first closing element (3) after a partial stroke comes into abutment with the second closing element (4) and also transfers this with its further opening movement into an open position (H), with adjusting rods (3a, 4a) for the closing elements (3, 4) arranged concentrically in each other, which are guided from a valve housing (2) outward out of the and into drive (70), and via which the closing elements (3, 4), in addition to the open position (H) and independently of each other, can each be brought selectively into a partially open position (T1, T2), wherein the open position (H) is generated by a main adjusting arrangement (200), and the partially open positions (T1, T2) are generated by the individual adjusting arrangements (300, 400) assigned to the respective closing element (3, 4), and the individual adjusting arrangements (300, 400) are arranged on the one hand between the main adjusting arrangement (200) and the valve housing (2) and on the other hand are arranged together with the main adjusting arrangement (200) in a common housing (71) of the drive (70), having a first drive piston (74) of the main adjusting arrangement (200) that engages in the direction of the associated fully open position (H) at the first adjusting rod (3a) for the first closing element (3) against the force of a first spring (96), and having a third drive piston (80) of the second individual adjusting arrangement (400) for the second closing element (4), which can be brought in engagement in a driving connection with a second adjusting rod (4a) of the second closing element (4), in the direction of the associated second partial opening (T2), wherein the first drive piston (74) on the side thereof facing the valve housing (2) is delimiting a first pressure medium chamber (82) for generating the fully open position (H), and on the side of the third drive piston (80) facing away from the first pressure medium chamber (82), a third pressure medium chamber (86) is provided for generating the second partially open position (T2), wherein:

the first drive piston (74) is fixedly connected directly or indirectly to the first adjusting rod (3a), that the first pressure medium chamber (82) delimited on one side by the first drive piston (74) and is delimited on the other side by a housing floor (72) spanning the housing (71) transverse to the longitudinal axis of the drive (70),

that the drive (70) with the design of the double seat valve (1) having a first closing element (3) formed as a slide piston and a second closing element (4) formed as a seat plate, has on the side of the first drive piston (74) facing away from the valve housing (2) a fourth pressure medium chamber (88) for generating the first partially open position (T1), wherein the first drive piston (74) in the scope of the first individual adjusting arrangement (300) for the first closing element (3), can be pushed in an axial direction out of the closed position of the double seat valve (1) by the first partially open position (T1) counter to the direction of the open position (H), and

that the drive (70), with the design of the double seat valve (1) having two closing elements (3, 4) formed as seat plates, has in the housing floor (72) on the side of the first drive piston (74) a second drive piston (78), which is axially movable so that it forms, together with the housing floor (72), a second pressure medium chamber (84) of the first individual adjusting arrangement (300) for the first closing element (3) for generating the first partially open position (T1), wherein the second drive piston (78) can be moved around the first partial stroke (T1) in the direction of the open position (H) for engaging in a driving connection with the first drive piston (74).

2. The double seat valve having a drive (70) for switching the valve according to claim 1 wherein:

the first spring (96) is arranged between the housing floor (72) and the valve housing (2), and in each case engages directly or indirectly on one side at the housing floor (72) and on the other side at the first adjusting rod (3a).

3. The double seat valve having a drive (70) for switching the valve according to claim 1, wherein

the housing (71), in the housing section thereof facing toward the valve housing (2), is formed by a control unit (104), which in the axial extension region of the drive (70) forms a radial outside part of said drive.

4. The double seat valve having a drive (70) for switching the valve according to claim 3, wherein

the control unit (104) is positioned within the largest outer radial dimension of the drive (70), wherein this dimension alone is generated by the components of the drive (70) mechanically defining the kinematics of the drive (70).

5. The double seat valve having a drive (70) for switching the valve according to claim 3, wherein

the control unit (104) is annular.

6. The double seat valve having a drive (70) for switching the valve according to claim 5, wherein

the annular control unit (104) is designed closed.

7. The double seat valve having a drive (70) for switching the valve according to claim 3, wherein

the control unit 104 is arranged on the side of the housing floor (72) facing the valve housing (2) and is connected thereto in a form-locking and/or friction-locked manner.

8. The double seat valve having a drive (70) for switching the valve according to claim 3, wherein

the control unit (104) accommodates all connections and channels for controlling a pressure medium (D;

D1, D2, D3;

D4, (D4)) for pressurizing the at most four pressure medium chambers (82, 84, 86, 88) through at least one pilot valve (108.1), all connections, electrical lines and signal lines, at least one position detection or distance measurement mechanism (110.1) and all means of control logic (111).

9. The double seat valve having a drive (70) for switching the valve according to claim 3, wherein

in the first drive piston (74) a hollow rod (74a) is securely anchored which, starting from the first drive piston (74), penetrates movably and sealed through the housing floor (72), engages movably in a first blind hole (104c) in the control unit (104) and ends there, that an inner channel (74a.1) completely penetrating the hollow rod (74a) connects the pressure medium chamber (88) to the first blind hole (104c) in a manner to pass fluid, and that the first blind hole (104c) can be supplied by a fourth pressure medium (D4;

(D4)).

10. The double seat valve having a drive (70) for switching the valve according to claim 3, wherein

in the first drive piston (74) a rod (74b) is securely anchored which, starting from the first drive piston (74), penetrates movably and sealed through the housing floor (72), engages movably in a second blind hole (104d) in the control unit (104) and ends there, and that the rod (74b) is assigned at least the position detection or distance measurement mechanism (110.1).

11. The double seat valve having a drive (70) for switching the valve according to claim 10, wherein

the hollow rod (74a) and the rod (74b) are arranged diametrically in the first drive piston (74).

12. The double seat valve having a drive (70) for switching the valve according to claim 3, wherein

a third position detection or distance measurement mechanism (110.3), arranged in the control unit (104), is assigned to the drive-side end of the second adjusting rod (4a).