Valves, valved fluid transfer devices and ambulatory infusion devices including the same

1. A valve, comprising:

a valve housing including an opening;

a valve seat that extends around the opening;

a valve element that is movable relative to the valve seat between a closed position where the valve element engages the valve seat to prevent flow through the opening and an open position where the valve element is in spaced relation to the valve seat to allow flow through the opening; and

a spring that biases the valve element against the valve seat;

wherein one of the valve seat and the valve element includes a main portion and a seal portion that is less tacky than the main portion and is in contact with the other of the valve seat and the valve element when the valve element is in the closed position.

2. The valve claimed in claim 1 , wherein

the housing includes a circumferentially extending slot; and

a portion of the spring is located within the slot.

3. The valve claimed in claim 1 , wherein

the spring is configured to permit the passage of fluid therethrough.

4. The valve claimed in claim 1 , further comprising:

the valve element includes a carrier that mounts the valve element on the spring.

5. The valve claimed in claim 1 , wherein

the valve element includes the main portion and the seal portion that is less tacky than the main portion.

6. The valve claimed in claim 1 , wherein the valve element includes an uneven surface that engages the valve seat.

7. The valve claimed in claim 1 , wherein

the valve element has an end portion that faces the opening;

the end portion faces the opening and is aligned with the opening when the valve element is in the open position; and

the end portion faces the opening and is aligned with the opening when the valve element is in the closed position.

8. The valve claimed in claim 1 , wherein

the valve element faces the opening and is aligned with the opening when the valve element is in the open position; and

the valve element faces the opening and is aligned with the opening when the valve element is in the closed position.

9. The valve claimed in claim 1 , wherein

the main portion and the seal portion are formed from different materials.

10. A valve, comprising:

a valve housing including an opening;

a valve seat that extends around the opening; and

a valve element that is movable relative to the valve seat between a closed position where the valve element engages the valve seat to prevent flow through the opening and an open position where the valve element is in spaced relation to the valve seat to allow flow through the opening;

wherein one of the valve seat and the valve element includes a main portion, formed from an elastomeric material selected from the group consisting of silicone rubber, latex rubber, fluoropolymers, urethane, butyl rubber, and isoprene, and a seal portion that is less tacky than the main portion and is in contact with the other of the valve seat and the valve element when the valve element is in the closed position.

11. The valve claimed in claim 10 , wherein

the valve element includes the main portion and the seal portion that is less tacky than the main portion.

12. The valve claimed in claim 10 , wherein the valve element includes an uneven surface that engages the valve seat.

13. A valve, comprising:

a valve housing including an opening;

a valve seat that extends around the opening; and

a valve element that is movable relative to the valve seat between a closed position where the valve element engages the valve seat to prevent flow through the opening and an open position where the valve element is in spaced relation to the valve seat to allow flow through the opening;

wherein

one of the valve seat and the valve element includes a main portion and a seal portion that is less tacky than the main portion and is in contact with the other of the valve seat and the valve element when the valve element is in the closed position;

the main portion is formed from an elastomeric material; and

the seal portion is selected from the group consisting of

a layer of silicon suboxide on the main portion,

a relatively thin layer of a relatively hard elastomeric material,

a relatively thin layer of a fluoroelastomer or a low friction protective coating, and

a coating of a filler material.

14. The valve claimed in claim 13 , wherein

the valve element includes the main portion and the seal portion that is less tacky than the main portion.

15. The valve claimed in claim 13 , wherein the valve element includes an uneven surface that engages the valve seat.

16. A valve, comprising:

a valve housing including an opening;

a valve seat that extends around the opening; and

a valve element that is movable relative to the valve seat between a closed position where the valve element engages the valve seat to prevent flow through the opening and an open position where the valve element is in spaced relation to the valve seat to allow flow through the opening;

wherein

one of the valve seat and the valve element includes a main portion and a seal portion that is less tacky than the main portion and is in contact with the other of the valve seat and the valve element when the valve element is in the closed position;

the main portion is formed from an elastomeric material; and

the seal portion is selected from the group consisting of

a surface of the valve seat main portion that has been halogenated,

a surface of the valve seat main portion that has been implanted with ions of a ceramic material or ions of a metal material or ions of a metal oxide material, and

a surface of the valve seat main portion that has been implanted and coated with ions of a ceramic material or ions of a metal material or ions of a metal oxide material.

17. The valve claimed in claim 16 , wherein

the valve element includes the main portion and the seal portion that is less tacky than the main portion.

18. The valve claimed in claim 16 , wherein the valve element includes an uneven surface that engages the valve seat.