Abstract: A differential pressure valve is disclosed, comprising: a valve body, the valve body having at least one flow inlet and one flow outlet; at least one shutter, the shutter being movable between an open position and a closed position under a differential pressure across the valve; a flow passage from the flow inlet to the flow outlet; at least one biasing member configured to bias the shutter towards a closed position so as to block the flow passage through the flow inlet. The biasing member comprises at least two springs arranged in parallel, one of the springs having at least one resonance frequency different from at least one resonance frequency of the other of the two springs.

Abstract: Disclosed herein is a differential pressure poppet valve comprising: a valve body, the valve body having at least one flow inlet and at least one flow outlet; at least one shutter guide disposed inside the valve body; at least one poppet shutter guided by the shutter guide; at least one flow passage from the flow inlet to the flow outlet, the flow passage being formed between an inside surface of the valve body and an outside surface of the shutter guide and of the poppet shutter. The valve further comprises at least one biasing member configured to bias the poppet shutter towards a closed position so as to block the flow passage through the flow inlet. To reduce impact wear at least a first damper is provided, configured and arranged to at least partly absorb impact energy of the poppet shutter when the poppet shutter opens or closes the flow inlet.

Abstract: Cam actuated valves for compressors including mechanisms for changing an instant when the cam actuated valve is opened and/or a time interval during which the cam actuated valve is in an open state within the time range of a compression cycle. A reciprocating compressor has: a body including a compression chamber; a cam having an oblong portion, being located inside the body and being configured to be rotated around a rotation axis, to perform a rotation during each compression cycle; an actuating element located inside the body and configured to receive a linear displacement or an angular displacement due to the oblong portion of the cam; and a valve located on a flow path of the fluid toward or from the compression chamber and configured to be switched to an open state by the actuating element. The reciprocating compressor also includes a controller configured to adjust timing of the valve.

Abstract: Reciprocating compressors having a rotative valve and related methods are provided. A reciprocating compressor has a compression chamber configured to compress a fluid that has entered the compression chamber via an intake, and it is discharged from the compression chamber, after being compressed, via a discharge, an actuator configured to supply an angular displacement, and a rotative valve configured to receive the angular displacement and to determine whether the intake and the discharge are opened or closed depending on the angular displacement. The rotative valve has a rotatable disk configured to rotate due to the angular displacement and having a first opening allowing a suction fluid flow to enter the compression chamber when the first opening overlaps the intake, and a second opening allowing a discharge fluid flow to exit from the compression chamber when the second opening overlaps the discharge.

Abstract: A compressor includes a piston disposed in a housing and configured to be reciprocatably driven in the housing by an electromagnetic drive. A conventional linear motor drive assembly reciprocatably drives the piston in an embodiment. A magnetically-geared drive assembly reciprocatably drives the piston in another embodiment. A solenoid drive assembly reciprocatably drives the piston in another embodiment. A control system is coupled to the drive for varying piston displacement, and an accumulator conserves force by decelerating a translating assembly at the end of one stroke and accelerating the assembly in a subsequent stroke.

Abstract: Positive drive valve actuating mechanisms useable to operate a valve of a reciprocating compressor for oil and gas industry and related methods are provided. The valve actuating mechanism includes a driver configured to perform a rotating motion and a follower connected to a mobile part of the valve and to the driver. The follower is configured to transform the rotating motion of the driver into a reciprocating motion to open the valve and to close the valve, respectively.

Abstract: A compressor including a pair of opposed pistons disposed in a housing and defining a compression chamber. An electromagnetic actuator reciprocatedly drives the pistons within the housing in cooperation with force accumulator. The force accumulators bank the force during a first reciprocation, decelerating the pistons, and apply the force in a subsequent reciprocation, thereby accelerating the pistons.

Abstract: An automatic valve including a valve seat having first gas flow passages extending there through and a valve guard having second gas flow passages extending there through. The valve further comprises at least one shutter member movably arranged between the valve guard and the valve seat, at least one set of spring members biasing the at least one shutter member towards a closed position in sealing engagement with the valve seat to close the first gas flow passages, and at least one spring holder ring provided with a plurality of spring retention seats. Each spring member of the set of spring members is partially housed in a respective spring pocket formed in the valve guard and retained in a respective one of the spring retention seat.

Abstract: A valve assembly including an actuator configured to provide a displacement, a shaft configured to transmit the displacement from the actuator to a valve closing member of a valve of the reciprocating compressor, and a displacement transmission mechanism connected to the shaft, and configured to amplify the displacement and/or a force associated with the displacement provided by the actuator to actuate the valve closing member of the valve.

Abstract: An actuated rotary valves for reciprocating compressors used in oil and gas industry, the valve including a stator with a stator opening, a rotor with a rotor opening, and an actuation mechanism. The actuation mechanism is configured to receive a rotation motion and to actuate the rotor to perform first an axial translation moving away from the stator and then a rotation. The actuation mechanism includes an outer shaft configured to receive the rotation motion, and an inner shaft inside the outer shaft and configured to rotate the rotor. The outer shaft is configured to rotate a predetermined angular displacement while pushing the rotor away from the stator before engaging the inner shaft to rotate together with the rotor.

Abstract: A reciprocating compressor for the oil and gas industry, the reciprocating compressor has a chamber, a timing valve, an actuator and a controller. A fluid entering the chamber via a suction valve is compressed inside the chamber, and evacuated from the chamber via a discharge valve. The timing valve is located between the chamber and a fluid volume at a relief pressure that is lower than a pressure in the chamber when the timing valve is opened. The actuator is configured to actuate the timing valve. The controller is configured to control the actuator such that to open the timing valve during an expansion phase of the compression cycle, and to close the timing valve when the relief pressure becomes equal to the pressure in the chamber or when the suction valve is opened.

Abstract: Apparatuses and methods overcoming the technical challenges in actuating valves of reciprocating compressors used in oil and gas industry are provided. A valve assembly includes an actuator, a shaft, a collar and a thrust bushing. The actuator is configured to generate a displacement. The shaft configured to receive a rotating motion caused by the displacement and to penetrate inside a compressor body of the reciprocating compressor. The collar is located close to a location where the shaft penetrates inside the compressor body. The thrust bushing is located between the collar and the compressor body. The rotating motion actuates a valve closing member of a valve inside the compressor body.

Abstract: Reciprocating compressors used in oil and gas industry having actuated rotary valves with sealing profiles between a rotor and a stator thereof and related methods are provided. An actuated rotary valve includes a stator having a stator opening, and a rotor having a rotor opening. At least one of the rotor and the stator has a sealing profile extruding from a surface of the rotor or of the stator towards an interface there-between, the sealing profile surrounding a respective one of the rotor opening or the stator opening.

Abstract: An automatic valve comprising a valve seat with first gas flow passages extending there through, and a valve guard having second gas flow passages extending there through. Sealing rings are arranged between the valve guard and the valve seat. A removable seat plate is removably connected to the valve seat and is provided with apertures matching with the first gas flow passages of the valve seat. The sealing rings are resiliently biased by resilient members against the removable seat plate to close the valve. The seat plate and the rings are made of non-metallic material.

Abstract: A differential pressure valve is disclosed, comprising: a valve body, the valve body having at least one flow inlet and one flow outlet; at least one shutter, the shutter being movable between an open position and a closed position under a differential pressure across the valve; a flow passage from the flow inlet to the flow outlet; at least one biasing member configured to bias the shutter towards a closed position so as to block the flow passage through the flow inlet. The biasing member comprises at least two springs arranged in parallel, one of the springs having at least one resonance frequency different from at least one resonance frequency of the other of the two springs.

Abstract: Disclosed herein is a differential pressure poppet valve comprising: a valve body, the valve body having at least one flow inlet and at least one flow outlet; at least one shutter guide disposed inside the valve body; at least one poppet shutter guided by the shutter guide; at least one flow passage from the flow inlet to the flow outlet, the flow passage being formed between an inside surface of the valve body and an outside surface of the shutter guide and of the poppet shutter. The valve further comprises at least one biasing member configured to bias the poppet shutter towards a closed position so as to block the flow passage through the flow inlet. To reduce impact wear at least a first damper is provided, configured and arranged to at least partly absorb impact energy of the poppet shutter when the poppet shutter opens or closes the flow inlet.

Abstract: Disclosed is a differential pressure valve comprising: a valve body, the valve body having at least one flow inlet and one flow outlet: at least one shutter, the shutter being movable between an open position and a closed position under a differential pressure across the valve; at least one flow passage from the flow inlet to the flow outlet; at least one biasing member configured to bias the shutter towards a closed position so as to block the flow passage through the flow inlet. The biasing member is a non-linear biasing member.