A mechanical valve assembly for the control of a gas flow to a gas appliance. The mechanical valve assembly includes at least one input knob movably connected to a housing, a shaft assembly connected to at least one input knob, and a manually-operated valve located inside the housing and in between the inlet port and the outlet port. The manually-operated valve is mechanically connected to the shaft assembly, and the manually-operated valve is configured for opening and closing a gas flow between the inlet port and the outlet port.

A mechanical valve assembly for the control of a gas flow to a gas appliance. The mechanical valve assembly includes at least one input knob movably connected to a housing, a shaft assembly connected to at least one input knob, and a manually-operated valve located inside the housing and in between the inlet port and the outlet port. The manually-operated valve is mechanically connected to the shaft assembly, and the manually-operated valve is configured for opening and closing a gas flow between the inlet port and the outlet port.

An HVAC system and method for characterizing a chosen VAV valve involves measuring the valve's volumetric flow rate versus valve position at just one or at some other limited number of data points and comparing that to the average characteristics a rather large group of similar valves. A custom characterization of airflow versus valve position for the chosen VAV valve is then created based on a difference between the characteristics of the chosen valve and that of the group of valves. In some examples, the VAV valve is of a venturi style such that a generic characterization of the group of valves is substantially linear when their flow rates are expressed logarithmically.

A bellows valve includes a first bellows connected to a first cap member at one end and to a support member at the other end, and a second bellows connected to a second cap member at one end and to said support member at the other end. Respective first and second bellows cavities are thus formed inside each bellows. An orifice is arranged to fluidly interconnect the first and second bellows cavities, and a bellows-internal valve device is arranged to selectively open and close the orifice. The bellows-internal valve device includes first and second resilient members arranged on respective first and second sides of the support member and having respective portions being coupled to respective first and second holding members on the valve device. The bellows valve is useful in injection valves, such as gas lift valves.

A vacuum valve, having a valve seat including a valve opening (axis (A)), and a first sealing surface around the valve opening and defines a first sealing plane (E.sub.S), having a valve disk with a second sealing surface corresponding to the first sealing surface and defining a second sealing plane (E.sub.T), additionally having a first coupling element, connected to the valve disk and comprising a receiving means and a drive unit coupled with the first coupling element and is configured to provide the valve disk adjustable from an open position to a closed position. The drive unit and the valve disk are configured to provide a fine control position, wherein the valve disk is tilted relative to the valve seat where E.sub.S and E.sub.T enclose a defined angle (α), and the seal abuts fully against one of the two sealing surfaces and in part against the other sealing surface.

A valve includes a housing with a mounting portion, a venting portion, and a cap portion. The valve also includes a piston in the housing with a shaft, a disc, and a flange, the piston being moveable between a closed position and an open position. The valve also includes a vessel that is in contact with the cap portion and the flange wherein fluid pressure contained in the vessel biases the piston into one of the opened position and the closed position.

A breaker valve assembly for a nuclear reactor containment includes a valve body, a valve body insert, and a lid. The valve body includes a first side wall defining a chamber, a first opening in a top portion of the first side wall, and a second opening in a bottom portion of the first side wall. The second opening communicates with the first opening of the valve body. The valve insert body includes a second side wall defining a second chamber, and a third opening in a bottom portion of the second side wall. The valve insert body is nested in the valve body. The lid is arranged on an upper edge of the side wall of the valve insert body. The valve insert body is configured to move substantially vertically with respect to the valve body.

The invention provides a method of, and means for, connecting components of a moveable sub-assembly in a fluid control valve. To control a dimensional characteristic of the moveable sub-assembly, a first component of the sub-assembly can be crimped to create a mechanical connection to a second component of the moveable sub-assembly. The sub-components may be configured such that in the absence of the crimp they can be moveably translated between a plurality of positions and they may be slideably translatable between a number of relative positions, while the crimp acts, once formed, to retain the sub-components in a chosen position relative to one another.

The invention provides a method of, and means for, connecting components of a moveable sub-assembly in a fluid control valve. To control a dimensional characteristic of the moveable sub-assembly, a first component of the sub-assembly can be crimped to create a mechanical connection to a second component of the moveable sub-assembly. The sub-components may be configured such that in the absence of the crimp they can be moveably translated between a plurality of positions and they may be slideably translatable between a number of relative positions, while the crimp acts, once formed, to retain the sub-components in a chosen position relative to one another.

A gas supply control device includes a main body, a control valve assembly extending into and received in the main body, a bottom lid attached to a bottom surface of the main body, and a top cover attached to a top surface of the main body. The gas supply control device provides an effect of simplicity and accuracy of gas supply therethrough.