摘要:
A sensor base structure (24) for supporting high and low pressure sensors (20,22) having autoclave type connectors (44) and communicating pressurized fluid from the main flowline (10) to the sensors. The sensor base structure comprises a cylindrical manifold (52) having a longitudinal passage (54) therein and including a plurality of lateral bores (58) extending therethrough intersecting the longitudinal passage. One end (60) of each lateral bore threadably receives the autoclave connectors of the respective pressure sensors. The opposite end (61) of the bore (58) threadably receives a plug (62) having an externally threaded portion (64) and a reciprocal autoclave connector (66) facing the pressure sensor to provide a high pressure metal-to-metal seal upon contact with the respective autoclave connectors. Each plug has fluid communication means (70, 72, 74) therethrough such that when the plug is positioned within the lateral bore the reciprocal autoclave connector of the plug is in fluid communication with the longitudinal passage of the manifold. Furthermore, the plug includes a secondary sealing means (76, 78, 80) to provide a seal between the plug and lateral bore of the manifold. The plug allows the respective pressure sensors to be rotated to a preselected rotational alignment relative to each other and the sensor base while providing a metal-to-metal autoclave seal and secondary seal to prevent the escape of pressurized fluid from the sensor base structure.
摘要:
An improved pilot control relay valve is disclosed to monitor pressure conditions in a system and to shut down in response to the detection of pilot pressure outside a predetermined range. Dual piston action actuates a visual indicator mounted on the slide valve of the control relay valve.
摘要:
A valving mechanism for a lung controlled pressure respirator system which uses a mask which fits to the head of a person and includes an outer mask portion adapted to be sealed around the periphery of the person's face and an inner mask portion arranged within the outer mask portion, comprises a housing wtih a flexible diaphragm which extends across the interior of the housing. On one side of the diaphragm the housing is exposed to atmospheric pressure and on the opposite side it is connected to a pressure space defined between inner and outer mask portions of the oxygen mask. The housing also has a control valve portion in communication with the opposite side of the diaphragm. A respirator breathing air supply conduit is connected to the control valve portion. The closing piston valve is movable in the control valve portion and has a port which is alignable with the breathing air supply conduit to permit flow from the breathing air supply conduit to the control valve portion and through the communication of the control valve to the pressure space between the inner and outer mask of the oxygen breathing mask. The construction includes a control tipping lever which is pivotally mounted between the control diaphragm and the closing piston valve and has an arm portion which is engageable with the diaphragm and is displaceable by movement of the diaphragm to displace the closing piston between positions in which the port varies its position in respect to disalignment witwh the supply conduit so as to vary the amount which is supplied into the pressure space between the inner and outer mask of the breathing mask.
摘要:
There is disclosed a system wherein a valve in a line is moved between flow controlling positions by means of a fluid-operated actuator. The admission and exhaustion of line fluid to and from the actuator is controlled by sensors which are automatically responsive to predetermined high and low pressure of the line fluid.
摘要:
A relay valve for controlling fluid flow to and from a valve actuator included in a safety system for a flowline such as a production line of an oil or gas well. The relay includes a slide valve (60) which is manually pushed inwardly to the open or set position and held therein by pilot fluid which is also applied to the valve actuator. A visual indicator mounted on a knob (102) of the slide valve is operated by fluid applied to a passage (96) formed in the slide valve. A vent port (82) prevents pilot pressure from moving the slide valve from the closed position to the open position. A modified relay valve (150) has separate inlet ports (198 and 200) for receiving pilot fluid and actuator fluid and a vent port (206) which is in direct fluid communication with the pilot port in the closed position of the slide valve.
摘要:
A valve assembly comprises a valve body having a hollow and a valve element longitudinally movable between first and second positions therein. The valve assembly has at least one inlet and at least one outlet in pressure communicating relation to the hollow. The valve element in its first position blocks pressure communication between the inlet and the outlet. In its second position, the valve element permits pressure communication between the inlet and the outlet. A pressure sensitive indicator is operatively associated with the valve element. The assembly provides pressure communication between the inlet and the indicator when the valve element is in one of its positions and blocks such pressure communication in the other position. The assembly may also include other inlets and outlets, and the high pressure inlets are preferably longer than the respective controlling seals. Thus the seals need not cross the inlets to control flow therethrough. The bypass valve assembly can be incorporated in a system for monitoring pressure within a fluid flow-line and selectively controlling fluid flow in that line and in a method for testing the controlling apparatus without interruption of flow in the line being monitored.
摘要:
Disclosed is a pilot valve assembly for preferred use in conjunction with pneumatically operated safety valves of a well head assembly, the pilot valve apparatus including an automatic trip assembly composed of a pair of bourdon tubes adapted to engage respective thumbwheels on a translatable stem; a seal carrier assembly responsively translated between first and second blocking and non-blocking positions between entrance and exit ports; a reset valve assembly for placing the pilot apparatus in its initial "untripped" position; and a manually operated trip valve assembly for independently translating the seal carrier assembly.
摘要:
The valve spool of a three-way pilot valve responds to changes in pressure in a pipeline downstream from a shut-off valve that is biased to close by spring pressure and has a control cylinder to admit pressurized control fluid to open in opposition to the spring pressure. When the pipeline pressure is in the normal range the valve spool is at a normal position where it places the pressurized control fluid in communication with the control cylinder of the shut-off valve to keep the shut-off valve open. When the pipeline pressure drops below the normal range the valve spool moves in one direction from its normal position to a first alternate position to cause the shut-off valve to close and when the pipeline pressure rises above the normal range the valve spool moves in the opposite direction to a second alternate position to cause the shut-off valve to close. At each of the two alternate positions of the valve spool, it cuts off the source of pressurized fluid and at the same time vents the control cylinder of the shut-off valve to close the shut-off valve. When the pipeline pressure returns to the normal pressure range, the valve spool returns automatically to its normal position to open the shut-off valve.
摘要:
There is disclosed herein a gas pressure regulator having valve means for stopping the flow of gas downstream through the regulator when the pressure of the incoming gas is higher or lower than predetermined acceptable values even though acceptable pressure is subsequently restored, and manually operated means for resetting the valve means after it is determined that the pressure of the gas flowing to the inlet of the regulator has returned to said predetermined acceptable values, provision being made for maintaining a high pressure shut-off valve closed until manually opened even though pressure of gas in the regulator returns to acceptable pressure.
摘要:
A subsurface safety valve well tool securable in a well conduit for controlling flow of fluid through the bore of the conduit. An increase or decrease in the well pressure from the normal flowing pressure of the well operates a rotatable ball valve to block flow of fluid through the conduit. Increasing and then decreasing the pressure in the bore above the ball valve rotates the valve to enable flow of fluid through the conduit.