Abstract: A sealing device between a reciprocator and a stationary encircling housing comprises first and second rolling diaphragms at opposite ends of the reciprocator and exposed to higher and lower pressures, respectively, diaphragm-supporting liquid in first and second chambers in the respective diaphragms, and pumping means which, owing to the reciprocation, pumps liquid from the second chamber to the first. This means comprises an annular seal carried by the reciprocator, sliding on the housing and acting as a piston and as an inlet non-return valve, and another annular seal carried by the housing, sliding on the reciprocator and acting as an outlet non-return valve.

Abstract: A sealed joint between concentric inner and outer cylindrical members comprises an annular sleeve of flexible fluid impervious material of U-shaped cross section having the end of one leg secured to the inner surface of the outer cylindrical member and the end of the other leg secured to the outer surface of the inner cylindrical member. The sleeve can be a double sleeve, of closed configuration. The ends of the double sleeve can be spaced apart, or secured together, or integral. A fluid under pressure can be introduced into the confines of the double sleeve.

Abstract: A method of permanently uniting two cylindrical members with mating end edges which cooperate to define a circumferential groove that is closed except for a continuous inner circumferential slot defined by the end edges. In the method, the mating end edges of the two members are brought together to imprison the peripheral bead of a flexible diaphragm under axial compression in the circumferential groove so that the web of the diaphragm extends through the continuous circumferential slot. The two cylindrical members are then held together under pressure while a cap with a cylindrical skirt is telescoped onto one member past the joint between its mating edge and that of the other member. Prior to this telescoping step, the inner wall of the skirt is coated with a suitable adhesive to provide an adhesive layer between the confronting skirt and cylindrical wall areas of the final assembly. The two cylindrical members are maintained under pressure until the adhesive sets, after which the pressure is released.

Abstract: A rigid and deformable hydraulic seal for a force-applying mechanism, the seal being interposed between a piston and a housing cavity. This seal is generally cup-shaped and has an annular outer end portion that is rigidly retained in a peripheral groove of the housing cavity. Adjacent to this end portion is a half torus or single convolution hoop portion open toward the cavity, with the seal further including a generally cylindrical side surface and a circular bottom portion, with this seal, together with the cavity, defining a fluid-tight variable volume chamber. Fluid pressure supplied to this chamber causes plastic deformation of the seal and permits relative motion to occur between the piston and housing.

Abstract: A weighing apparatus comprises a plurality of hydraulic load cells each including a piston, a cylinder, and a flexible diaphragm of fluid impervious material sealed in the cylinder and overlying the piston to form a fluid pressure receiving chamber. The cylinders are interconnected in spaced coaxial relation on a main support frame. The pistons are similarly mounted on a floating frame which comprises a number of threaded rods which permits reciprocal piston movement relative to the cylinder and to the main frame. A force sensitive output signal generator is mounted in the main frame in operative relation to the interconnected pistons to receive forces from them when fluid pressure is received in any of the pressure receiving chambers. The pistons are adjustably clamped to the threaded by nuts so that the piston-cylinder spacing may be changed for calibration purposes.

Abstract: In a power piston for use in a booster which includes a piston plate coupled with a diaphragm for receiving differential pressure acting thereacross, a valve body one end of which being secured to the center portion of the piston plate and a valve mechanism disposed in the valve body, the improvement resides in that there are provided a head portion and a hole respectively on one end of the valve body and in the center portion of the piston plate which have complementary configurations such that the hole can receive the head portion only when they are at specific angular positions, and there is provided a neck portion continuous with the head portion of the valve body and having an axial length sufficient to receive the piston plate thereon, the inner circumferential portion of the diaphragm is clamped by means of the piston plate and thus secured to the valve body.

Abstract: A servomotor having a front shell with an annular wall in which an annular groove is located adjacent to an open end thereof. A rear shell has a peripheral ledge with radial lugs which are aligned in slots on the annular wall of the front shell. A diaphragm secured to a hub, which can move within the annular wall, has a bead with a contour which matches the annular wall from the annular groove to the slots. The peripheral ledge on the rear shell engages and compresses the bead of the diaphragm against the annular wall and groove of the front shell to separate a front chamber from a rear chamber when tabs on the open end of the annular wall lock the lugs against the slots.

Abstract: The present invention comprises a small, precise measuring pump provided with a germ barrier that is specifically designed for intravenous feeding devices in which the fluid being pumped is positively displaced; in which there is no rubbing contact of one member with another which would be destructive of blood being pumped; the pumping chambers are small, so that they will hold as little fluid as possible; and in which the valves are actuated by gravity and which are tight-sealing when the pump is in a substantially vertical position, but which, when the pump is tipped on its side, are open to permit the preliminary filling of the pump with the fluid to be pumped.

Abstract: A valve assembly comprises a body having an inlet and an outlet, a chamber between the inlet and the outlet, a valve diaphragm fitted in the valve body and attached to a rigid closure member adapted to close the inlet with the periphery of the diaphragm supported by a wall of the chamber, and an auxiliary control, or pilot valve communicating with the chamber, said diaphragm comprising an annular member of rubber-like material with a thin outer peripheral portion and a thickened inner portion.

Abstract: A rolling diaphragm not subject to the formation of cusps. The rolling wall of the diaphragm is made up of two regions, one region intended to engage the lateral wall of the piston of the rolling diaphragm device, and another region intended to extend from the lateral wall of the piston of the rolling diaphragm device to the diaphragm clamping region formed by the cylinder body of the rolling diaphragm device. In the first mentioned region the rate of change of diameter along the rolling wall is relatively small, or minimized. The second region is circularly shaped in cross-section. The radius of curvature of the cross-section of that portion is relatively large, so that the rate of change of diameter of the rolling wall in that portion thereof is relatively large.

Abstract: A connection of a rolling diaphragm to the inner one of two coaxially arranged piston and cylinder elements, the diaphragm having a thickened end accommodated in a groove in the wall of an annular face of the piston. An elastic ring clamped about the piston locks the thickened end of the seal in the groove.