A drill string safety valve device (1) has a body (2) with a through-going flow bore (25) and connectors (3, 4) at respective ends (19, 18) for connection to tubulars, such as pipe joints. A valve member (7; 29) is movably arranged in said flow bore (25) and configured for being set in one of two states: a first state of the valve member allows fluid to flow in both directions though the flow bore, and a second state of the valve member allows fluid flow through the flow bore in only one direction. The valve member may be a rotatable ball valve (7) with a through-going flow bore (21).

The present application relates to a safety valve, in particular a safety valve which can be released by manual operation and automatic operation. The safety valve comprising: valve body having an inlet, an outlet and a releasing port; and valve core being movable within the valve body between a close position in which the inlet communicates with the outlet and an open position in which the inlet communicates with the releasing port, the valve core comprises a resilient member which biases the valve core to the close position; wherein the position of the valve core can be manually or automatically controlled such that the valve core is able to switch between the close position and the open position, fluid flows from the inlet to the outlet in the close position and flows from the inlet to the releasing port in the open position.

A multi-gas-source heater is disclosed including a main shell, an ignition apparatus, a pipeline system arranged on the main shell, a temperature-sensing valve, a burner and a switching valve; the pipeline system has a first and second communication states; the temperature-sensing valve is connected to the pipeline system and can regulate flow of output gas; the burner includes a first and second nozzles both connected to the pipeline system; the ignition apparatus is connected to and can ignite the burner; the switching valve is connected to and can switch the pipeline system between the first and second communication states; when the switching valve switches the pipeline system to the first communication state, the first nozzle outputs the gas; when the switching valve switches the pipeline system to the second communication state, the second nozzle outputs the gas, or the first and second nozzles both output the gas.

A multi-gas-source heater is disclosed including a main shell, an ignition apparatus, a pipeline system arranged on the main shell, a temperature-sensing valve, a burner and a switching valve; the pipeline system has a first and second communication states; the temperature-sensing valve is connected to the pipeline system and can regulate flow of output gas; the burner includes a first and second nozzles both connected to the pipeline system; the ignition apparatus is connected to and can ignite the burner; the switching valve is connected to and can switch the pipeline system between the first and second communication states; when the switching valve switches the pipeline system to the first communication state, the first nozzle outputs the gas; when the switching valve switches the pipeline system to the second communication state, the second nozzle outputs the gas, or the first and second nozzles both output the gas.

An example valve includes: (i) a pilot seat member comprising a first channel and a second channel, a pilot seat, and a pilot sleeve portion comprising a pilot chamber and a cross-hole; (ii) a pilot check member disposed in the pilot chamber and subjected to a biasing force of a setting spring, wherein the pilot check member is configured to be subjected to a fluid force of fluid in the second channel; and (iii) a solenoid actuator sleeve slidably accommodated about the pilot sleeve portion, wherein the solenoid actuator sleeve comprises a cross-hole and an annular groove, wherein the cross-hole of the solenoid actuator sleeve is fluidly coupled to a second port of the valve, and the annular groove is configured to selectively fluidly couple the first channel to the second channel based on a position of the solenoid actuator sleeve.

An example valve includes: (i) a pilot seat member comprising a first channel and a second channel, a pilot seat, and a pilot sleeve portion comprising a pilot chamber and a cross-hole; (ii) a pilot check member disposed in the pilot chamber and subjected to a biasing force of a setting spring, wherein the pilot check member is configured to be subjected to a fluid force of fluid in the second channel; and (iii) a solenoid actuator sleeve slidably accommodated about the pilot sleeve portion, wherein the solenoid actuator sleeve comprises a cross-hole and an annular groove, wherein the cross-hole of the solenoid actuator sleeve is fluidly coupled to a second port of the valve, and the annular groove is configured to selectively fluidly couple the first channel to the second channel based on a position of the solenoid actuator sleeve.

A drop-detection device (11, 11a, 11b) for the detection of drops (TR) that escape from a nozzle of a metering valve (DV), preferably a micro-metering valve, is described. The drop-detection device (11, 11a, 11b) comprises a signal-generation unit (20), which is configured to produce a carrier signal (TS) with a defined pulse frequency. In addition, the drop-detection device (11, 11a, 11b) has a modulation unit (30, 30a) which is configured to generate a modulated signal (MS) due to a physical interaction of the carrier signal (TS) with a drop to be detected (TR), Furthermore, the drop-detection device (11, 11a, 11b) has an evaluation unit (50), which is configured to determine if a drop (TR) has been dispensed by the metering valve (DV) based on the measurement signal (MS) under consideration of the defined pulse frequency. A method (600) of detecting a drop (TR) of a metering valve (DV) is also described.

A drop-detection device (11, 11a, 11b) for the detection of drops (TR) that escape from a nozzle of a metering valve (DV), preferably a micro-metering valve, is described. The drop-detection device (11, 11a, 11b) comprises a signal-generation unit (20), which is configured to produce a carrier signal (TS) with a defined pulse frequency. In addition, the drop-detection device (11, 11a, 11b) has a modulation unit (30, 30a) which is configured to generate a modulated signal (MS) due to a physical interaction of the carrier signal (TS) with a drop to be detected (TR), Furthermore, the drop-detection device (11, 11a, 11b) has an evaluation unit (50), which is configured to determine if a drop (TR) has been dispensed by the metering valve (DV) based on the measurement signal (MS) under consideration of the defined pulse frequency. A method (600) of detecting a drop (TR) of a metering valve (DV) is also described.

A pressure relief valve is provided. The pressure relief valve includes a hollow body having an inlet and an outlet, with the hollow body including at least one aperture extending through a surface of the hollow body. An actuator assembly is attached to the hollow body and a sleeve is slideably positioned about the hollow body, with the sleeve moveably attached to the actuator assembly. During operation, the actuator assembly moves the sleeve from a first position that covers the aperture to a second position that uncovers at least a portion of the aperture.

Provided is a safety valve (10) comprising a body (12) which defines an incoming fluid passage (14) and a return fluid passage (20). The incoming fluid passage (14) generally enables a fluid to pass from a fluid reservoir (18) through the body (12) to the tool head (16). The return fluid passage (20) generally enables a fluid to return from the tool head (16) through the body back to the fluid reservoir (18). The body (12) further comprises a diverter (22) which is displaceable between an active position and an inactive position. When the diverter (22) is in the active position, the diverter (22) redirects the fluid via a shunting passage (24) from the incoming fluid passage (14) to the return passage (20) to prevent operation of the tool head (16).