Abstract: A cryogen storage vessel at an installation is filled with liquid cryogen from a liquid cryogen storage tank that has a pressure lower than that of the vessel. After headspaces of the vessel and tank are placed in fluid communication with another via a gas transfer vessel and are pressure-balanced, a pump in a liquid transfer line connected between the tank and the vessel is operated to transfer amounts of liquid cryogen from the tank to the vessel via the liquid transfer line and pump as amounts of gaseous cryogen are transferred, through displacement by the pumped cryogenic liquid, from the vessel to the tank.

Abstract: A hydraulic pumping assembly provides reciprocating motion to a sucker rod string coupled to a downhole pump. The pumping assembly includes a hydraulic cylinder, a cylinder rod, a telescoping cylinder sleeve for increasing the effective stroke length, and a cylinder base positioned below the hydraulic cylinder. The hydraulic cylinder includes a cylinder barrel, a cylinder head, a piston, and a port configured to direct hydraulic fluid to and from the cylinder barrel. The piston is coupled to the cylinder rod at an upper end of the rod. The cylinder rod slides within the cylinder sleeve, which passes slideably through the cylinder head. The cylinder sleeve moves between an extended position and a retracted position as the piston reciprocates within the cylinder barrel. The cylinder base accommodates the cylinder rod and the telescoping cylinder sleeve in a collapsed position.

Abstract: A floor pump includes a base, a cylinder, a hose assembly, a valve assembly, a piston rod, and a pressure sensing device. The cylinder is mounted on the base. The hose assembly includes a hose, a nozzle, and a recess connected with each other. The valve assembly is mounted in the base and connected between the cylinder and the hose assembly. The piston rod is connected with a piston reciprocable inside the cylinder. The pressure sensing device is disposed in the recess and interconnected with the valve assembly. The pressure sensing device can measure the pressure value of the air flowing into the pressure sensing recess and is connectable with a mobile electronic device via wireless transmission for indicating the air pressure value.

Abstract: An air pump, including: two cylinders, a big one and a small one, is fitted to each other by a contractible way. A head connects with the out end of the small cylinder. A pressure relief valve connects with the out end of the big cylinder. A first piston is fixed at the in end of the small cylinder and placed in the big cylinder. A first pipe, one end fixes on the out end of the big cylinder, and the other passes through the first piston and places inside the small cylinder. A first chamber with a passage communicating with the first pipe forms therein between the inside wall of the big cylinder and the outside wall of the first pipe. A second pipe, one end fixes at the out end of the small cylinder and communicates with the head in one-way air admission and the other fits into the first pipe by contractible way and communicates with it. A second piston, which is placed inside the small cylinder, fixes at the other end of the first pipe and the second pipe goes through it.

Abstract: A telescopic dual movement pump has a nozzle assembly, a central tube connected to the nozzle assembly, a first tube enclosing the central tube and slidable relative to the central tube and a second tube enclosing the first tube and slidable to the first tube. The central tube has a first piston assembly which includes a block slidably received in the first tube. The first tube has an end provided with a second piston assembly which includes a second block slidably received in the second tube. The movement of the block and the second block in two opposite directions is able to force air inside the pump to be ejected out of the pump.

Abstract: A manual air pump with a handle includes a base member, a foot switch, an outlet cylinder, an inner cylinder and a pumping assembly. The foot switch is mounted on the base member. The outlet cylinder is mounted vertically on the base member. The inner cylinder is mounted vertically on the base member in the outer cylinder. The pumping assembly is moveably mounted in the outer cylinder and securely attached to the inner cylinder. Multiple check valves are mounted in the cylinders and the base member to form two stages to pump the air into the object to be inflated in a great quantity when the object to be inflated is in a low-pressure condition and easily pump compressed air into the object to be inflated when the object to be inflated is in a high-pressure condition.

Abstract: A telescopic dual movement pump has a nozzle assembly, a central tube connected to the nozzle assembly, a first tube enclosing the central tube and slidable relative to the central tube and a second tube enclosing the first tube and slidable to the first tube. The central tube has a first piston assembly which includes a block slidably received in the first tube. The first tube has an end provided with a second piston assembly which includes a second block slidably received in the second tube. The movement of the block and the second block in two opposite directions is able to force air inside the pump to be ejected out of the pump.

Abstract: A manual air pump with a handle includes a base member, a foot switch, an outlet cylinder, an inner cylinder and a pumping assembly. The foot switch is mounted on the base member. The outlet cylinder is mounted vertically on the base member. The inner cylinder is mounted vertically on the base member in the outer cylinder. The pumping assembly is moveably mounted in the outer cylinder and securely attached to the inner cylinder. Multiple check valves are mounted in the cylinders and the base member to form two stages to pump the air into the object to be inflated in a great quantity when the object to be inflated is in a low-pressure condition and easily pump compressed air into the object to be inflated when the object to be inflated is in a high-pressure condition.

Abstract: A double-acting reciprocating motor with a uni-directional fluid flow path comprises a piston disposed within a cylinder. Within the cylinder, the piston defines a first chamber between the piston and a cylinder base and a second chamber between the piston and a cylinder head. Fluid is introduced into the first chamber of the motor through an inlet port associated with the cylinder base. A pass-through valve controls the flow of fluid from the first chamber to the second chamber. An outlet valve regulates the draining of fluid from the second chamber through an outlet port associated with the cylinder head. Fluid pressure within the first chamber urges the piston towards the cylinder head when the pass-through valve is closed and the outlet valve is open. The piston surface facing the second chamber is larger than the piston surface facing the first chamber, so the piston moves towards the cylinder base when the pass-through valve is open and the outlet valve is closed.

Abstract: An air pump comprises an outer tube, a distribution guide tube, and a spring. The outer tube is provided in the interior with a large cylinder and a small cylinder. The distribution guide tube is disposed at the lower end of the outer tube and is provided with two air chambers, one of which is in communication with the large cylinder and is provided with a pressure leaking slide block, two leakproof rings, and an annular groove located between the two leakproof rings for forming a duct. The spring is disposed in the air chamber for providing the pressure leaking slide block with a recovery spring force. Another air chamber of the distribution guide tube is in communication with the large cylinder and the small cylinder for discharging air to inflate an inflatable object.

Abstract: A medium and high pressure pump systems supplies a cryogenic fluid from a storage tank and methods of operating such systems to remove both liquid and vapor from the storage tank to reduce the need for venting. The system comprises a pump that is operable to pump cryogenic liquid or a mixture of cryogenic liquid and vapor. In accordance with the method, mass flow rate through the pump is controlled by selecting one of at least two operating modes. In a first operating mode a high flow rate is achieved by supplying cryogenic liquid to the pump from the storage tank to substantially fill a compression chamber within the pump with liquid. In a second operating mode, a lower mass flow rate is achieved by selectively simultaneously supplying liquid and vapor from the storage tank to the pump, with the vapor fraction being higher in the second operating mode compared to the first operating mode.

Abstract: A manual air pump includes an outer cylinder having a first chamber and a head provided to the second end of the outer cylinder. The head includes an outlet passage communicated with the first chamber for supplying air to an object to be inflated. An inner cylinder is securely mounted in the first chamber of the outer cylinder and includes a first end secured in the second end of the outer cylinder and a second end, the inner cylinder defining a second chamber that is communicated with the outlet passage. A piston rod has a first end with a piston slidably received in the first chamber of the outer cylinder and a second end extended beyond the outer cylinder, the piston separating the first chamber into a first chamber section adjacent to the head and a second chamber section distal to the head, the piston rod defining a third chamber therein. A handle is secured to the second end of the piston rod to move therewith.

Abstract: A floor air pump comprises an outer tube, a pressure leaking device, a pressure gauge, and an air discharge tube. The outer tube is provided with two cylinders different in size from each other. The pressure leaking device is disposed in the lower end of the outer tube and is provided in the interior thereof with a receiving compartment in communication with the large cylinder. The receiving compartment is provided with a pressure leaking slide block, and at least two leakproof rings to keep the inner wall of the receiving compartment in the airtight state. The pressure leaking slide block is provided with an annular groove for forming a channel along with the pressure leaking slide block. The receiving compartment is provided therein with a spring to provide the pressure leaking slide block with a recovery force. The pressure gauge is disposed in the outer side of the outer tube such that the pressure gauge is in communication with the interior of the outer tube.

Abstract: A pneumatically driven pump includes a piston threadably connected to each end of a common connecting hollow rod which is inserted over a pumped material receiving tube, with this assembly enclosed in a housing. The pistons reciprocate in response to compressed air sequentially directed through different air ports in the housing, alternatively drawing in pumped material and then pumping it out of the pump through the pumped material tube along the center of the pump. A check valve at each of the inflow and outflow ends of the pump prevents back flow of the pumped material.

Abstract: A pump comprises a pair of coaxial pistons, one slidably positioned in the other for simultaneous compression causing similarly directed air flow, independent passages and valves for permitting air flow from each piston into the pump head for increased air flow, and a switching device for selectively opening one passage to ambient to decrease the air flow into the pump head. The pump thus has two modes, namely a high volume mode when the two pistons operate simultaneously to direct combined air flow and a high pressure mode when the passage is opened to ambient to direct air flow from only one of the two pistons.

Abstract: The dual stage, dual mode air pump is selectively operable in a low pressure, high volume mode or a high pressure, low volume mode. It includes a pump head, an outer tube that is engaged to the pump head, an inner tube that is engaged to the pump head and a middle tube that is slidably engaged to both the outer tube and the inner tube. A mode pump switch is utilized to allow the pump operator to change the mode of the pump. In the preferred embodiment, the mode switch is disposed within the pump head. It includes an air passageway having a manually switchable valve disposed therein. In the high volume, low pressure mode the valve switch is closed, whereupon pumped air passes into a pneumatic article engaged to the end of the pump. When the valve switch is opened, the pump is operable in the low volume high pressure mode, and a portion of the pumped air is outletted into the ambient environment, rather than being pumped into the pneumatic article.

Abstract: This invention features a small-enveloped (with an outside diameter of at least approximately 38 mm), single-acting, hydraulically-operated, reciprocating, deep-well, fluid-extraction pump, operable in non-straight and angular wells, and its mode of operation. The hydraulically-operated, deep-well pump, in addition to having an above-ground installation of its motor-fluid generator and of its control valving, comprises a compound, stepped piston that is reciprocably mounted within a cylinder which in turn is divided into individual pressure chambers. Hydrostatic pressure created by a hydraulic pump is selectively directed to two outlet ports to produce an overpressure in one of the outlet ports at any given instant. The overpressure in each outlet port leads to creation of overpressure in one or more pressure chambers. Imbalances in pressure among the pressure chambers result in movement of the compound, stepped piston and extraction of hydraulic-well fluid by the compound, stepped piston.

Abstract: A manually operable spray pump with a double-action pump and a detachable fluid reservoir. A pump cylinder has valves at each end to admit air into one of two pump chambers formed by a piston and means to simultaneously force air from the other chamber down a shaft and out over a fluid discharge port, thereby pulling fluid from the reservoir and spraying it from the device.

Abstract: A proportioning pump for liquid additive metering having a housing with a diaphragm piston therein and inlet and outlet primary fluid lines to said housing for moving said diaphragm piston up and down. Additive pistons for pumping an additive liquid into said primary fluid with said additive pistons being moved by said diaphragm piston.