Valve having first and second fluid ports

1. A device in a valve comprising:

a valve housing with at least a first and a second fluid port;

a closure element being arranged in the valve housing, the closure element having a sealing portion and comprising a diaphragm, the sealing portion being movable along an axis of the closure element by means of said diaphragm between an open position and a closed position of at least one of the fluid ports of the valve housing, the closure element together with the valve housing forming a flow passage in the valve housing which communicates with said fluid ports when the sealing portion leaves said closed position, a second sealing portion of the closure element adapted to come in contact with a support portion of the valve housing wherein the closure element is a unitary element, wherein said closure element comprises an opening for accommodating an actuator, wherein said actuator does not move said second sealing portion in a direction parallel to a longitudinal axis of the actuator; and

an abutment means being arranged in contact along a periphery of said second sealing portion in such manner that said second sealing portion is arranged between the support portion and the abutment means, the abutment means being arranged to transmit a force via said second sealing portion towards the support portion to provide a seal, and wherein said abutment means comprises a spring means.

2. A device as claimed in claim 1 , wherein said spring means is one of torsion springs and resilient springs with bending action.

3. A device as claimed in claim 1 , in which said spring means is a pressure spring arranged to provide a compressive force parallel with said axis.

4. A device as claimed in claim 1 , in which said spring means is a spring washer arranged to provide a compressive force parallel with said axis.

5. A device as claimed in claim 1 , in which the spring means is a spring washer.

6. A device as claimed in claim 1 , in which said second sealing portion of the closure element has a sealing region and the valve housing has a complementary seat portion for mutual sealing.

7. A device as claimed in claim 1 , in which the sealing portion of the closure element is operably connected to an actuator, the device further having a coupling device which has a locking means adapted to be connected to the valve housing, and an actuating device adapted to be connected to the coupling device to operate the actuator.

8. A device as claimed in claim 7 , in which the actuator is elongate and arranged so that its longitudinal axis coincides with said axis of the closure element and further arranged in an actuator recess through a recess in the coupling device.

9. A device as claimed in claim 7 , in which the abutment means is adjustably arranged in the coupling device by means of a thread bushing.

10. A device as claimed in claim 9 , in which the thread bushing is externally threaded and connected to a recess in the coupling device.

11. A valve, comprising:

a valve housing with at least a first and a second fluid port;

a closure element, arranged in the valve housing, having a first sealing portion and a second sealing portion, the first sealing portion being movable between an open position and a closed position, and the second sealing portion adapted to come in contact with a seat portion of the valve housing;

an abutment element adapted to urge a periphery of said second sealing portion toward the seat portion of the valve housing to provide a seal, wherein the abutment element comprises a spring; and

an actuator rotatably connected to the closure element and configured to move the first sealing portion between the open position and the closed position when rotated, wherein said closure element comprises an opening for accommodating the actuator, and said actuator does not move said second sealing portion in a direction parallel to a longitudinal axis of the actuator.

12. The valve of claim 11 , wherein the spring is a torsion spring.

13. The valve of claim 11 , wherein the spring is a resilient spring.

14. The valve of claim 11 , wherein the spring is a spring washer.

15. A valve, comprising:

a valve housing having an inlet and an outlet;

a closure element, arranged inside the valve housing, having a first sealing portion and a second sealing portion,

wherein the first sealing portion is movable from a first position within the housing to permit fluid flow between said inlet and said outlet to a second position within the housing to prevent fluid flow between said inlet and said outlet

wherein the second sealing portion is adapted to maintain a seal between a first portion of said valve housing and a second portion of said valve housing when the first sealing portion is moved from the first position to the second position, and

wherein said closure element comprises an opening for accommodating an actuator, wherein said actuator does not move said second sealing portion in a direction parallel to a longitudinal axis of the actuator; and

an abutment element arranged inside said valve housing, wherein said abutment element is adapted to urge said second sealing portion toward a seat of the valve housing to provide a seal.

16. The valve of claim 15 , wherein said abutment element comprises a compression spring.

17. The valve of claim 16 , wherein said abutment element is tensioned by the compression spring.

18. The valve of claim 15 , wherein said abutment element is tensioned by a spring washer.