Temperature compensated valve for gas chromatography
AssigneeMecanique Analytique Inc.
InventorsYves Gamache, André Fortier
Life of this patent
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Abstract
Plungers and plunger assemblies for a diaphragm-sealed valve are provided. Each plunger is adpted to be received in a passage of the valve body and includes a base member and an upper member having a longitudinal play in this passage with respect to the base member. A resilient middle element is provided between the upper and base member. The base member is connected to a plunger actuating mechanism within the valve body. Optionally, the upper member may be self-aligning within the passage. The plunger can be used to compensate for temperature variations experienced by the valve in use.
Claims21
A plunger for a diaphragm-sealed valve, the valve having a valve body provided with at least one passage extending in the valve body and opening on a diaphragm-contacting surface, a plunger-actuating mechanism being located within the valve body, said plunger being sized to slidably fit in a corresponding one of the at least one passage of the valve body and comprising:
- a base member operatively connectable to the actuating mechanism;
- an upper member projecting towards said diaphragm-contacting surface when in said passage, said upper member having a longitudinal play within said passage with respect to the base member;
- and
- a resilient middle element provided between the base member and the upper member.
A plunger assembly for a diaphragm-sealed valve, the valve having a valve body provided with a plurality of passages extending in the valve body and opening on a diaphragm-contacting surface, said plunger assembly comprising:
- a plunger-actuating mechanism located within the valve body;
- and
- a plurality of plungers each slidably provided in a corresponding one of the passage of the valve body, each plunger comprising:
- a base member operatively connected to the actuating mechanism;
- an upper member projecting towards said diaphragm-contacting surface when in said passage, said upper member having a longitudinal play within said passage with respect to the base member;
- and
- a resilient middle element provided between the base member and the upper member.
Dependencies are inferred from the claim text.