Valve manifold
First Claim
1. A four valve manifold for use with a flow meter or other instrument comprising body means, a flow passage extending longitudinally through said body means;
- a pair of inlet passages in said body means for introducing process fluid into said flow passage;
a pair of outlet passages in said body means for discharging process fluid from said flow passage;
a pair of line block valves for opening or closing said inlet passages while permitting process fluid to flow through said flow passage;
a vent passage in fluid communication with said flow passage, and a vent valve for controlling the venting of fluid from said vent passage; and
an equalizer valve between said line block valves for simultaneously closing said flow passge between said line block valves and said vent passage upstream of said vent valve.
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Accused Products
Abstract
Instead of the usual three or five valves a valve manifold includes four valves, namely a pair of line block valves intersecting a longitudinally extending flow passage in the valve body for normally closing inlet passages, an equalizer valve between the line block valves intersecting the flow passage; below the equalizer valve is a vent passage and a vent valve in the vent passage. During operation the line block valves are open to promote the flow of process pressure to the measuring instrument and the equalizer valve is closed to prohibit the flow along the longitudinally extending flow passage. The vent valve is in the open position. By closing the line block valves with respect to the inlet passages, while leaving them open with respect to the flow and outlet passages, closing the vent valve and opening the equalizer valve permits the flow to be balanced between each side of the manifold. Upon opening the vent valve the manifold can be vented.
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Citations
8 Claims
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1. A four valve manifold for use with a flow meter or other instrument comprising body means, a flow passage extending longitudinally through said body means;
- a pair of inlet passages in said body means for introducing process fluid into said flow passage;
a pair of outlet passages in said body means for discharging process fluid from said flow passage;
a pair of line block valves for opening or closing said inlet passages while permitting process fluid to flow through said flow passage;
a vent passage in fluid communication with said flow passage, and a vent valve for controlling the venting of fluid from said vent passage; and
an equalizer valve between said line block valves for simultaneously closing said flow passge between said line block valves and said vent passage upstream of said vent valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- a pair of inlet passages in said body means for introducing process fluid into said flow passage;
Specification