Abstract: A subsurface safety valve is operable to close a fluid flow path by virtue of an axially movable flow sleeve. The valve includes a recockable actuator and a latch mechanism so that the valve can be moved to a closed position without overcoming the pressure head and frictional forces currently encountered in conventional safety valves. The latch mechanism includes one or more micro pistons.

Abstract: A lock open device for use with a valve in a hydraulic fracturing system, which maintains the valve in an open position. The lock open device includes a plate with beveled edges and spring loaded ball bearings strategically disposed to contact the edges and interfere with axial movement of the plate. The plate couples to a gate member in the valve, so that the interference between the plate and the ball bearings maintains the valve in a designated open or closed position. The angle of the bevel regulates how much force is required to urge the plate past the ball bearings to thereby open/close the valve.

Abstract: A device for preventing leaks in a toilet that comprises a fill valve operatively connected to and disposed above a float. In certain embodiments an arm is rotably connected to the fill valve such that the arm comprises a pivot. A lever is, for example, pivotally connected to the pivot of the arm and biased towards the fill valve, wherein a flush actuator causes the lever to pivot away from the fill valve. The lever may comprise a first side and a second side joined at the pivot, wherein the first side weighs less than the second side, and wherein the distribution of weight between the first and second sides of the lever causes the lever to bias towards the fill valve.

Abstract: A connector for connecting a tank truck to an underground oil depot has a body, a handle, a transmission device and two locking arms. The body has a mounting tube and a connection tube respectively connected with an oil drain valve and an oil pipe. The handle is pivotally mounted on the body. The transmission device is pivotally connected to the handle and has a linking lever and two transmitting levers. The linking lever is pivotally connected to the handle, and the transmitting levers are pivotally and slidably connected to the linking lever. The locking arms are pivotally mounted on the mounting tube of the body, selectively extend into the mounting tube and are respectively connected securely to the transmitting levers. Each locking arm has a pushing protrusion mounted on the locking arm and is adapted to push against a joint on the oil drain valve.

Abstract: A locking assembly is provided to simply and effectively prevent any unintentional adjustment of the adjustable valve mechanism in a fluid flow control device, without compromising the function of the device. The locking assembly generally includes at least one gripping arm for frictionally engaging at least a portion of the adjustable valve mechanism, and an actuating mechanism for controlling the deployment and release of the gripping arm. The locking assembly prevents unintentional adjustments that can adversely affect the pressure settings of the fluid flow control device. In particular, the locking assembly prevents unintentional adjustment, such as may be caused by the presence of a strong external magnetic field. The locking assembly can be easily disengaged, such as through the application or removal of an external mechanical force, to allow a clinician to adjust the pressure settings of the fluid flow control device as necessary.