Abstract: A no tie down valve or device for the actuation of hazardous machinery. The device comprises a spool moving within a cylindrical cavity having capped ends; input ports, an output port, and an exhaust port are located at suitable positions on the cylindrical cavity wall such that a pressurized output can only be obtained if both inputs are pressurized, and subsequently held, within a small time interval determined by design parameters of the device. An equivalent construction in terms of poppet or diaphragm-type seals, which is inherently more reliable and maintainance-free than spool construction, is also described.

Abstract: A surface controlled subsurface safety valve having an operator and a pilot valve. The pilot valve controllably communicates pressurized control fluid to affect the operator and pressure balances the operator. This abstract is neither intended to define the scope of the invention, which, of course, is measured by the claims, nor is it intended to be limiting in any way.

Abstract: A concentrating vortex shaker for the simultaneous shaking and concentration of a multiplicity of liquid samples comprises a heat-conductive block having a plurality of openings for receiving laboratory vessels containing sample liquids and removably mounted on a base provided with an adjustable eccentric drive for displacing the block in a gyrating motion. An airtight cover is removably mounted on the block and forms a chamber above the samples which can be controllably evacuated. The samples can be heated or cooled by a temperature-controlled liquid which is fed through a channel formed in the block or heated by an adjustable electrical heater provided in the block mounting or cooled by a cooling plate, upon which the block mounts.

Abstract: A gas distribution system wherein a plurality of control valves in gas collection lines are actuated by signals of timed duration received from a pressure controller at a control station, the signals being generated in response to changes in gas pressure in a gas distribution network. Timer controlled adjustable cam operated switches control the time duration of signals delivered from the control station to each control valve. Manually actuated switches at the control station are connected to by-pass the controller to simultaneously deliver signals to each control valve such that all of the control valves can be simultaneously actuated. A failure sensing device is a telemeter transmitter to transmit signals related to pressure in the gas distribution network which is equipped with a failure sensing device to deliver signals to the control station to cut out the controller and timer if the transmitter fails for any reason.

Abstract: In an internal combustion engine air cleaner snorkel having an end open to ambient temperature air and an auxiliary inlet open to heated air, the induction air flow temperature is regulated by a pivoted damper assembly having a guide member positioned by a coiled bimetal and a damper member biased by a torsion spring for concomitant operation with the guide member. The damper member has a main blade portion responsive to the induction air flow rate and controlling ambient air flow and a pair of lateral blade portions controlling heated air flow but unresponsive to the induction air flow rate. Under conditions of high induction air flow the damper member moves away from the guide member against the bias of the torsion spring to permit ambient air flow through the open end and to block heated air flow through the auxiliary inlet.

Abstract: Mechanism for controlling flow of cleaning fluids under pressure to a discharge nozzle of cleaning apparatus using steam or hot water for industrial cleaning purposes. A control valve for controlling flow of the cleaning fluid is operated by other fluid introduced thereto by an automatically closing manually opened valve. The control valve is arranged to close gradually when the manually opened valve is permitted to close, to prevent shock loads in the fluid system.