A leak detector structure includes a base, a valve cylinder assembly, a rotary latch and an expansion member, the base includes a valve body, an inlet joint and an outlet joint, a receiving channel is defined in the valve body. The valve cylinder assembly includes a valve cylinder, a rotatable handle and a torsion spring, the valve cylinder is inserted in the receiving channel and connected with the rotatable handle, a communicating channel is defined in the valve cylinder, the communicating channel is operably passable or blocked with respect to the inlet joint and the outlet joint, and the torsion spring is fixed to the rotatable handle for pre-twisting. The rotary latch is pivotally connected to the base, and the rotary latch includes a snapping portion for engagement with the corresponding rotatable handle and a passive arm extended from the snapping portion.

A flow control valve including a main valve and a pilot valve for controlling a piston of the main valve. The valve maybe controlled through a control system based o{circumflex over ()}pn measured pressures or temperatures in a system supplied or controlled by the valve. The valve may be operated as a pressure independent control valve, using pressure measurement from a supply line and exit line or return line of a hydronic HVAC system as inputs to the control system, which is operable to maintain a constant pressure drop across the system, or the valve may be operated as a temperature independent control valve, using temperature measurements from a supply line and exit line or return line of a hydronic HVAC system as inputs to the control system which is operable to maintain a constant temperature drop across the system.

A pressure regulator for installing in a fluid flow system. The pressure regulator comprises a body and an identification device coupled to the body. The identification device has a first portion with first identification information and a second portion with second identification information. The second portion of the identification device is separated from the pressure regulator while the first portion of the identification device remains coupled to the pressure regulator. The second portion of the identification device is then affixed to a surface, such as a form.

A proportioning valve for a reverse osmosis system that controls the production of product water by the differential pressure across the purification membrane. By sensing increasing tank pressure to actuate the proportioning valve, the flow of waste water is restricted. Placement of seals within the cavity of the valve, as well as placement of waste water inlet and outlet ports, protects tension components that provide reverse tank pressure from waste water exposure. A needle valve assembly responsive to an actuating assembly that senses tank pressure removes the need for an inlet tank water port while restricting water flow.

A pressure regulator includes a valve body having a fluid inlet and a fluid outlet connected by a fluid passageway. An orifice is disposed between the fluid inlet and the fluid outlet. A valve seat is disposed within the fluid passageway. A movable valve plug is disposed within the fluid passageway, and the valve plug interacts with the valve seat to selectively open or close the fluid passageway. A cage is disposed in the fluid passageway, the cage surrounds the valve plug, and the cage includes a mechanical stop that limits movement of the valve plug within the cage away from the valve seat.

A pressure regulator includes a valve body having a fluid inlet and a fluid outlet connected by a fluid passageway. An orifice is disposed between the fluid inlet and the fluid outlet. A valve seat is disposed within the fluid passageway. A movable valve plug is disposed within the fluid passageway, and the valve plug interacts with the valve seat to selectively open or close the fluid passageway. A cage is disposed in the fluid passageway, the cage surrounds the valve plug, and the cage includes a mechanical stop that limits movement of the valve plug within the cage away from the valve seat.

Exemplary embodiments of the present disclosure include systems, apparatuses, and methods that are directed to controlling pressure in a pressurized flow system, such as a CO.sub.2-based chromatography system or other pressurized flow systems. Exemplary embodiments of the present disclosure comprise one or more apparatuses, systems or methods for implementing multiple pressure regulators to control pressure. In addition to providing pressure control, apparatuses, systems and methods described herein dampen damaging thermal effects caused by pressure drops of a mobile phase including CO.sub.2.

Exemplary embodiments of the present disclosure include systems, apparatuses, and methods that are directed to controlling pressure in a pressurized flow system, such as a CO.sub.2-based chromatography system or other pressurized flow systems. Exemplary embodiments of the present disclosure comprise one or more apparatuses, systems or methods for implementing multiple pressure regulators to control pressure. In addition to providing pressure control, apparatuses, systems and methods described herein dampen damaging thermal effects caused by pressure drops of a mobile phase including CO.sub.2.

Embodiments of a fuel system are disclosed. The fuel system includes a bypass valve (BPV), a fuel metering valve (FMV), a flow sense valve (FSV), and an actuator regulating valve (ARV). The BPV includes a BPV valve member that regulates fuel flow from a BPV inlet to a BPV outlet. The position of the BPV valve member is controlled by pressures at an inlet and an outlet of the FMV. The FSV includes an FSV valve member that regulates fuel flow from an FSV inlet to an FSV outlet. The ARV includes an ARV inlet that is in fluid communication with the FSV outlet, and fuel flow through an ARV outlet regulates downstream actuators. The position of the FSV valve member to produce fuel flow through the FSV outlet to the ARV inlet is controlled at least in part by a pressure at the BPV outlet.

The invention relates to a method for cooling a tool in a heat treatment furnace, wherein: the tool is supplied during normal cooling operation with coolant from a coolant reservoir through a supply inlet (1), which coolant is returned into the coolant reservoir from the tool via a return flow (2); the supply inlet (1) is coupled by means of an electric actuator (3) alternatively to the coolant reservoir or to the public water supply and the return flow (2) is coupled by means of a further electric actuator (3) alternatively to the coolant reservoir or to the public waste water system (4); the actuators (3, 3) are supplied with a feed current during normal cooling operation and held in a first position in which coolant is supplied to the tool through the supply inlet (5) from the coolant reservoir and the coolant is fed back through the return flow (2, 6) into the coolant reservoir; and, upon interruption in the power supply, the actuators (3, 3) are forced into an emergency position in which cold water is supplied to the tool through the supply inlet (7) from the public water supply and the water is discharged through the return flow (2, 8) into the public waste water system (4).