62results about How to "Reduce contact pressure" patented technology

The invention relates to the technical field of railway line flaw detection, in particular to railway line automatic comprehensive flaw detection equipment which comprises two steel rails and a flaw detection car and further comprises a C-shaped mounting plate, a buffer assembly, a waist detection mechanism and a bottom detection mechanism. A first fixing rod is transversely arranged in the C-shaped mounting plate, fixing sleeves are slidably connected to the two ends of the first fixing rod correspondingly, and balance assemblies are arranged at the ends, away from each other, of the two fixing sleeves correspondingly. The device has the advantages that different detection assemblies are arranged for different detection areas, so that steel rail detection of different parts is more efficient and accurate, it is ensured that different types of defects can be detected, the detection period is shortened, the balance assembly and the buffer assembly cooperate with each other to enable the head detection assembly to keep a dynamic balance state, and the detection efficiency is improved. The probe is effectively protected from vibration damage, and the adaptability of the probe to the change of the steel rail and the detection stability of the probe are improved.

The invention relates to the technical field of charging sockets, and particularly discloses a charging seat, which comprises a fixed block, a socket and a dustproof cover, the main locking block is movably assembled on the socket along the radial direction of the plugging cavity; the unlocking button is movably assembled on the socket along the depth direction of the plugging cavity; the connecting rod is connected between the main locking block and the unlocking button; the labor-saving lever is mounted on the socket; the boosting block is arranged at the resistance end of the labor-saving lever and is movably assembled on the socket along the depth direction of the insertion cavity; the pushing plate is movably assembled in the insertion cavity along the depth direction of the insertion cavity; the diameter of the inserting cavity is larger than that of the charging gun head, the pushing plate is provided with a pushing inclined face used for pushing the main locking block to move out of the inserting cavity, and the main locking block is provided with a main locking face. According to the charging seat, smooth plugging and unplugging actions are realized, and the reliability of charging connection and the user experience are improved.

The utility model discloses a constant power controller with pressure control for a high-pressure plunger pump, which comprises a shell, a variable piston is arranged in the shell, a return spring connected with the shell is arranged at the small end of the variable piston, a shifting block rotationally connected with the shell is arranged on the radial side of the variable piston, and a power control valve is arranged on one side of the shifting block. A variable supporting column extending towards the shifting block is arranged on the variable piston in the radial direction, a guide hole is formed in the end face of the variable supporting column, the bottom face of the guide hole is communicated with the small end of the variable piston, a variable plunger is arranged in the guide hole and comprises a plunger body and a sliding shoe, the plunger body is in sliding connection with the variable supporting column, and one side of the sliding shoe is in spherical hinge joint with the plunger body. And the other side of the sliding shoe is in surface contact with the shifting block. The utility model has the advantages of longer service life and higher constant power control precision.

The invention belongs to the technical field of spiral conveyors, and discloses a spiral conveyor which comprises a support and a conveying barrel, a gland and a gear box are installed at one end of the conveying barrel, a motor is installed at one end of the gear box, a main shaft is rotatably installed on the inner wall of the conveying barrel and the inner wall of the gear box, a first spiral piece is welded to the outer surface of the main shaft, and a second spiral piece is welded to the outer surface of the main shaft. The main shaft is driven by a motor, a feeding port and a discharging port are formed in the surface of the conveying cylinder, a replacement cylinder is rotationally installed in the middle of the inner wall of the conveying cylinder, and the outer surface of the replacement cylinder is movably sleeved with a buffering sleeve. When the first spiral piece rotates to convey materials, the speed difference generated between the first spiral piece and the replacement barrel can reduce the relative speed between the first spiral piece and the replacement barrel on the premise of not influencing material conveying of the first spiral piece, so that the abrasion degree between the replacement barrel and the first spiral piece is obviously reduced, and the service life of the device is prolonged.

This utility model discloses a wooden door for use with a floor spring, including a front panel (1) and a back panel (2). Two vertical beams (3) are provided between the front panel (1) and the back panel (2). An upper horizontal beam (4) and a lower horizontal beam (5) are provided between the front panel (1) and the back panel (2). Multiple reinforcing beams (6) are provided between the front panel (1) and the back panel (2). A limiting beam (7) is provided on the inner side of one of the vertical beams (3). The upper and lower ends of the limiting beam (7) are fixed to the upper horizontal beam (4) and the lower horizontal beam (5) respectively. The front panel (1) and the back panel (2) are both fixed to the limiting beam (7). A tightly fitted iron square tube (8) is provided between the limiting beam (7) and the vertical beam (3). The bottom of the iron square tube (8) is provided with a connecting shaft (9) that passes through the lower horizontal beam (5). The bottom of the connecting shaft (9) is provided with a socket (10) that mates with the floor spring. This utility model has the advantage of a long service life.

The utility model discloses a walking mechanism of an anti-corrosion operation and maintenance robot for a steel box girder structure bridge, which belongs to the technical field of robots and comprises a base, and anti-corrosion equipment is mounted on the base. Each walking part comprises a driving assembly connected to the bottom of the base, the output end of each driving assembly is connected with a connecting frame, a plurality of sliding grooves are formed in the bottom of the base, and the multiple sliding grooves correspond to the multiple walking parts in a one-to-one mode. According to the walking mechanism, the sliding groove with the two low ends and the high middle is formed, when the driving assembly drives the sliding block to move through the connecting frame and the connecting column, the sliding block moves from one end of the sliding groove to the other end of the sliding groove, the sliding block can conveniently drive the moving wheels to cross a gap through the mounting frame, and the walking mechanism can freely walk on a bridge floor; meanwhile, the moving wheels rise and then fall in the process of crossing the bridge deck gap, collision between the moving wheels and the bridge deck gap is effectively avoided, and the moving wheels and the bridge deck are protected.

A gas processing system includes a vessel (102) defining a cavity (106) for processing a gas. The vessel includes a process gas inlet (108) for receiving a process gas at an input pressure and a process gas outlet (110) for discharging the process gas at an output pressure. The gas processing system also includes a shaft (122) coupled to the vessel and a stepwise sealing system (114) including a plurality of seals (136) spaced along the shaft. The shaft is configured to transfer mechanical energy to or from the gas in the vessel. Each adjacent pair of seals defines a corresponding pressure space therebetween. One of the pressure spaces is an equalization pressure space (144a) in hydraulic communication with the process gas inlet via a flow line (116) such that, in operation, a pressure in the equalization pressure space is maintained at an equalization pressure relative to a pressure in the process gas inlet.

The utility model provides a cylindrical battery and a battery pack, the cylindrical battery comprises a shell and a battery cell assembly, the shell comprises a side plate and a bottom plate, and the battery cell assembly is arranged in the shell; the bottom plate is provided with a nick, so that the extrusion force generated by the shell to the bottom plate is relieved through the nick. According to the embodiment of the invention, the nicks are arranged on the bottom plate of the battery, and the nicks play a role in relieving the pressure caused by the expansion of the battery by relieving the contact pressure between the bottom plate and the shell. When the battery expands and the shell deforms, the two narrowed ends of the shell generate extrusion force on the bottom plate, and due to the existence of the nicks, the extrusion force of the shell on the bottom plate can be buffered. The effect can reduce the risk that the bottom of the battery protrudes or even is broken due to expansion, so that the stability of the battery is improved.

The utility model discloses a honing head structure and a honing device. The honing head structure comprises a honing head body, a plurality of installation bases arranged in the circumferential direction of the honing head body, polishing components arranged on the installation bases, a movable rod coaxially arranged and arranged in the honing head body in a penetrating mode, and an expansion and contraction component arranged on the movable rod in a sliding and sleeving mode and capable of sliding in the axial direction of the honing head body. The mounting base can expand and contract in the radial direction of the grinding head body, and the outer wall of the expanding and contracting component is matched with the inner wall of the mounting base, so that the expanding and contracting component can be driven to slide on the moving rod in the first direction when the mounting base shrinks in the radial direction, and the mounting base is driven to expand in the radial direction when the expanding and contracting component moves in the second direction; a pre-tightening elastic piece is arranged in the grinding head body and used for applying elastic force in the second direction to the expansion and contraction component so that the installation base can contract in the radial direction to drive the expansion and contraction component to slide, and then the expansion and contraction component can be driven to elastically reset. The honing and grinding device has the beneficial effect that the honing and grinding uniformity can be improved.

The invention belongs to the technical field of oil and gas drilling, and particularly relates to a PDC drill bit with an impact function. The PDC drill bit with the impact function comprises a drill bit body, a channel used for flowing of drilling fluid is formed in the drill bit body, and a punch is arranged in the drill bit body and linearly reciprocates with the central axis of the punch at a certain angle. The end, close to the working end of the drill bit body, of the punch can exceed the range of the drill bit body in the reciprocating motion process. The impact drill bit can solve the problem that an existing impact drill bit easily causes failure of PDC teeth.

The application discloses an ergonomically-based intercom soft silica gel ear hanging, and relates to the technical field of silica rubber composition and ear-wearing structure. The ear hanging adopts dimethyl-diphenyl block copolymerized methyl vinyl silicone rubber as a base body, is matched with vinyl siloxane grafted nanocellulose as a reinforcing filler, and forms a covalently crosslinked filler-base body interface through addition vulcanization; meanwhile, an 18\22mm ear contour contact arc surface curvature and a 1.2\2.0mm gradient wall thickness structure are arranged. The phenyl segment of the block base body and the siloxane chain of the grafted filler form a synergistic interface effect, under the condition of a low hardness of 22-28 degrees of Shore, the material tear strength is greater than or equal to 18kN / m, and the rebound retention rate is greater than or equal to 92% after 168h of thermal aging at 85 DEG C; the ergonomics structure and the material performance are synergistic, the unit contact pressure of the ear contour is reduced by more than 35%, there is no obvious pressure pain in long-term wearing, and the comfort and durability requirements of long-time wearing of the intercom in outdoor duty scenes are met.

This invention discloses a torque balancing device and an oil supply and return system, belonging to the technical field of submersion motion test equipment. The torque balancing device is installed on a submersion motion test bench, which includes a column, a platform located inside the column, a crossbeam fixed to the top of the column, and a lifting actuator fixed above the crossbeam. The movable end of the lifting actuator is connected to the platform. The torque balancing device is located between the column and the platform. It is used to counteract the overturning torque caused by the control error of the lifting actuator and the overturning torque caused by a malfunction in the control system of the submersion motion test bench, thus enabling the platform to move vertically along the column. The torque balancing device includes a torque balancing cylinder, a ball joint, and a hydrostatic support plate. The torque balancing cylinder is fixed to the corner beam of the platform, and the hydrostatic support plate is attached to the surface of the column. The piston rod of the torque balancing cylinder is connected to the ball head of the ball joint by screws, and the ball socket of the ball joint is connected to the hydrostatic support plate by screws.

This utility model discloses a comfortable medical protective mask, including a mask body, a mask surface, and ear loops. The mask body includes a mask surface and two plastic frames symmetrically arranged on both sides of the mask surface. A face support strip, fixedly connected to the mask surface, is arranged parallel to the inner side of both plastic frames. An ear loop is provided on one side of each plastic frame via a mating protrusion, and an adjustment block is installed on the ear loop. A first strap and a second strap are respectively provided at the top of the two ear loops. A buckle is provided at the top of the first strap, and a fixing strip matching the buckle is provided at the top of the second strap. This utility model, by symmetrically arranging two plastic frames on both sides of the mask surface and providing a face support strip fixedly connected to the mask surface parallel to their inner sides, creates a three-dimensional space inside the mask surface when unfolded, providing a more comfortable breathing experience when worn.

This invention relates to the field of motor mounting stability testing technology, specifically to a motor mounting stability testing device based on multi-environment simulation. The device includes a testing box containing a fixed plate. A vibration frame is mounted on top of the fixed plate, and a mounting base for supporting and mounting the motor is mounted on top of the vibration frame. Mounting strips are flexibly mounted on both sides of the mounting base. Inverted T-shaped rods are symmetrically positioned at the bottom of the mounting strips, sliding through the mounting base. A second spring is positioned between the lower end of the inverted T-shaped rod and the bottom of the mounting base, and the second spring is sleeved on the inverted T-shaped rod. Multiple pressure sensors are also mounted at the bottom of the mounting strips. By installing pressure sensors at the bottom of the mounting strips and utilizing the reset characteristics of the second springs to construct a follow-up detection structure, when any mounting bolt loosens or its preload decreases, the mounting strip will partially lift under the action of the second spring, resulting in a significant reduction in the contact pressure between the corresponding pressure sensor and the bottom of the mounting groove.

The invention relates to the technical field of power supply systems, in particular to a distributed energy supply output system of an energy storage power station, which comprises a charging management module, a distributed control relay, at least two groups of battery cluster units, a switching device and an inverter module, and is characterized in that the battery cluster units are in power supply connection with the inverter module through the switching device; the switching device can be used for selecting and switching while uninterruptedly supplying power among the battery cluster units; the distributed energy supply output system is suitable for a small-sized energy storage power station, and can be switched among the battery cluster units through the arranged switching device, so that the energy storage power station can continuously supply power to the outside, and the distributed control relay is matched to charge the battery cluster units which are in an idle state after the electric quantity is used up.

The utility model provides a notebook computer expansion radiator, including bearing frame, both sides below of bearing frame are fixedly installed with the tray and the converging box respectively, wherein the tray below surface fixedly installed at least two anti -skidding platform, its above middle fixed mounting limit protruding; The converging box installs the cooling fan on, the air current passage that is provided with the air inlet that corresponds to on the inside of bearing frame is opened, is opened in bearing frame and air current passage all with the through -hole, the inside of bearing frame is provided with the positioning slot, the utility model discloses through air current passage, air inlet etc. form closed -loop airflow, accurate suction and exhaust hot air, improve the heat dissipation efficiency, the rubber air current passage prevents scratching and is suitable for wide, and bearing frame and anti -skidding platform etc. multi -dimensional fixed notebook computer, guarantee alignment accurate and use safety.

Provided is a compressor. The compressor includes a piston structure including a guide member that reciprocates in an axial direction inside a cylinder, and a magnet frame that supports a moving member that moves together with the piston structure. The piston structure includes the guide member, a mounting member connected to the magnet frame, and an elastic member that can be elastically deformed and is disposed between the guide member and the mounting member. The guide member further includes a first coupling portion that is coupled to an inner circumferential surface of the elastic member, and the mounting member further includes a second coupling portion that is coupled to an outer circumferential surface of the elastic member.

The present invention provides a lubrication and drag reduction device for the movement of an intestinal endoscope robot, and its structure includes an oil and gas overflow module, an oil and gas supply module, an oil and gas control module, an oil and gas pipeline, a mounting plate, a controller, a remote control, and a workbench. The oil and gas overflow module and the oil and gas supply module are connected by pipelines and fixedly installed on the workbench, and the oil and gas control module is electrically connected to the oil and gas supply module and is controlled by the controller and remote control. The drag reduction device of the present invention is mainly used in the field of medical intestinal robots, and can reduce the travel resistance of the intestinal endoscope robot during operation, improve the motion performance of the robot system, and improve the safety and reliability of medical operations.

The utility model relates to the technical field of valves, in particular to a sealing ball valve for water inlet of a water turbine. The valve comprises a valve body, a valve, a valve seat, a valve rod and a swing mechanism. A pressure supply port and a medium inlet are formed in the inlet end and the outlet end of the valve body; the valve is rotationally arranged in the valve body, a circulation through hole is formed in the valve, and the circulation through hole can communicate with the inlet end and the outlet end in the rotating process of the valve; the two valve seats are connected to the inlet end and the outlet end, piston cylinders are formed by the valve seats and the inner walls of the inlet end and the outlet end respectively, sealing pieces are arranged in the piston cylinders, elastic pieces are connected between the sealing pieces and the valve seats, the pressure supply port is communicated with the piston cylinders and located between the valve and the sealing pieces, and the medium inlet is located on the same side of the valve and the sealing pieces; the valve rod is connected with the valve and rotationally connected with the valve body. The swing mechanism is connected with the valve rod. The sealing surface of the sealing piece can be prevented from being excessively abraded, and the sealing effect between the sealing piece and the valve can be guaranteed for a long time.

This utility model relates to the field of extruder technology, specifically disclosing an extruder for producing cables, comprising: a worktable, an extruder housing fixedly connected to the upper surface of the worktable, a feed hopper fixedly connected to the upper surface of the extruder housing, a drive assembly disposed on the outer surface of the extruder housing, and a screw fixedly connected to the output end of the drive assembly. Through a planetary transmission structure consisting of a protective box, a drive motor, a central gear, three sets of transmission gears, a limiting gear ring plate, and a linkage rod within the drive assembly, the drive motor drives the central gear to rotate, causing the three sets of transmission gears to rotate planetarily under the constraint of the limiting gear ring plate, and then drives the screw through the linkage rod. This structure can evenly distribute the driving force, reducing the contact pressure of the screw when conveying raw materials. It is suitable for the rapid and uniform conveying of low-viscosity raw materials, and can also handle high-viscosity raw materials to prevent screw jamming and deformation, meeting the feeding requirements of various viscosities and improving the equipment's adaptability to different cable raw materials.

The utility model discloses an inner octagonal pipe belongs to pipe material technical field, including the pipe body of octagonal structure, the inner chamber of pipe body also is octagonal structure, the pipe body includes work section, flared connecting section and embedded connecting section, is equipped with the transition section between work section and flared connecting section, and flared connecting section and transition section are located one end of work section, and embedded connecting section is located the other end of work section, flared connecting section, transition section work section and embedded connecting section integrated molding. The pipe body of octagonal structure in the utility model, compared with the circular pipe body, has increased the contact surface area between pipes, and is more stable in storage and transportation, is convenient for safe stacking, and the contact pressure between pipes is small, and the pipe is not easy to deform, the pipe cavity of octagonal shape, and the traditional circular pipe cavity of same inner diameter is greater than the pipe cavity capacity, and the drainage capacity is increased, the first wave crest on work section M type or n type increases the surface area of contact with the outside, and the pressure intensity that the pipe body receives reduces, and the service life is improved.

This application relates to the field of flame retardant testing equipment technology, and in particular to an easily adjustable glow wire testing device. The device includes a glow wire assembly mounted on a chassis, an adjustable clamping assembly located on the other side of the chassis opposite the glow wire assembly, and a buffer assembly on the side of the glow wire assembly facing the adjustable clamping assembly. By mounting the glow wire assembly and the adjustable clamping assembly on the chassis, the installation position of the workpiece relative to the glow wire can be adjusted via the adjustable clamping assembly, thereby adjusting the contact point between the glow wire and the workpiece to adapt to the testing requirements of different workpieces. Furthermore, the buffer assembly on the side of the glow wire assembly facing the adjustable clamping assembly reduces the contact pressure between the glow wire and the workpiece, preventing damage to the glow wire during operation. This allows for flexible adjustment of the contact point between the glow wire and the workpiece to adapt to the testing requirements of different workpieces, effectively improving the efficiency of the glow wire testing.

The application relates to the technical field of compact pigging, and discloses a compact pig, which comprises a shell, a bypass valve is fixedly arranged at the side wall of the shell, a main ball valve one is fixedly arranged at the top of the side wall of the shell, a main ball valve two is fixedly arranged at the bottom of the side wall of the shell, a drainage valve is fixedly arranged at the bottom of the side wall of the shell, a purification valve is fixedly arranged at the side wall of the shell, a quick-opening blind plate is rotatably arranged at the side wall of the shell, a pigging shell is slidably arranged at the inner wall of the shell, when the pigging shell moves, the impeller is subjected to the thrust of liquid, rotates, drives the rotating shaft and the rotating block to synchronously rotate, when the rotating block rotates, the cleaning plates are forced to move, when the rotating block rotates to a certain angle, the thrust on the two cleaning plates is lost, the rotating blocks continuously rotate, the cleaning plates are alternately contacted with the pipe wall, the contact pressure is lower, the friction is smaller, under the same pushing pressure difference, the power is more easily maintained, and the pigging shell can be kept moving for a longer time.

The application provides a cleaning device and a cleaning equipment. The cleaning device comprises a device body, a rolling brush rotatably arranged on the device body, and a water outlet assembly arranged on the device body and configured to spray water on the rolling brush. The water outlet assembly comprises a receiving groove. A scraping assembly is arranged below the water outlet assembly and comprises a main plate, an adapter and an elastic member. The adapter is rotatably connected to the water outlet assembly or the device body. The main plate is divided into a first part and a second part by a rotation axis of the adapter. The first part is in interference contact with the rolling brush. The elastic member is in elastic abutment with the second part and the water outlet assembly to drive the second part away from the receiving groove. The application adjusts the inclination angle of the main plate by rotating the main plate driven by the rolling brush, so that the rolling brush can clean the dirt left on the surface of the main plate. When the rolling brush reverses, the contact pressure between the rolling brush and the main plate is reduced, thereby reducing the abrasion of the rolling brush fabric.

A comfort system, a vehicle seat including the comfort system, and a method of operating the comfort system are disclosed. The comfort system includes a plurality of comfort units disposed within the vehicle seat; a control module that communicates signals with the plurality of comfort units to control the operation of the plurality of comfort units; and a plurality of sensors, including at least one or more sensors adapted to sense displacement of the plurality of comfort units (e.g., strain gauges), air pressure within the comfort units (e.g., pressure sensors), or both.

This invention relates to the field of fuse technology and discloses a modular combined 10kV drop-out intelligent fuse, comprising: an insulating support and a mounting base disposed on the insulating support, and further comprising: an insulating cover fixed above the insulating support; a current transformer fixed above the insulating cover; a voltage plate fixed inside the current transformer and extending downward into the insulating cover; a thermal auxiliary component fixed to the insulating cover and the voltage plate; a swing base fixed below the insulating support; and a rocker arm rotatably disposed on the swing base. This invention uses a shape memory alloy spring as a passive thermal sensing and power output element, combined with a sealed hydraulic transmission, intermittent gear energy storage, and impact acceleration structure, to achieve highly reliable and rapid disconnection of the fuse tube and voltage plate under overload conditions. The entire thermal triggering mechanism is a purely mechanical passive solution, requiring no external power supply or electronic control unit, exhibiting strong anti-electromagnetic interference capability, and can stably trigger protection under extreme conditions of power failure and strong electromagnetic interference, thus improving the reliability of protection action.

The present invention discloses a crankshaft, which is divided into an upper crankshaft including a first rotating shaft and a lower crankshaft including a second rotating shaft and an eccentric part; one end of the upper crankshaft connected to an external motor protrudes in all directions along the axis direction to form a thrust portion. The crankshaft protrudes outward to form a thrust portion, which increases the thrust area, reduces the contact pressure, and improves the wear resistance of the wear surface. The present invention also provides a compressor having the crankshaft.

The breaker 1 comprises a fixed piece 2, a movable piece 4, a thermally-actuated element 5 and a resin case 10. The fixed piece 2 has an embedded portion 25 embedded in the resin case 10 in a region which overlaps with the thermally-actuated element 5 in a plan view viewed in the thickness direction. The resin case 10 has an outer peripheral portion 74 formed on the outer perimeter of a recessed portion 73, a first penetrating portion 75 penetrating the recessed portion 73 to expose the embedded portion 25 to the thermally-actuated element 5 side, an island portion 76 interposed between the fixed piece 2 and the thermally-actuated element 5 in the inside of the first through portion 75, and a connecting portion 77 connecting between the outer peripheral portion 74 and the island portion 76.

The utility model belongs to the technical field of test fixtures, and particularly relates to a printed circuit board test fixture which comprises a test fixture body, a clamping plate is installed at the bottom end of the surface of the test fixture body, a sliding rod is arranged on the surface of the back side of the test fixture body, and a platform is installed on the surface of the top end of the test fixture body. A side plate is installed on the side of the clamping plate, a fixing plate is arranged on the side face of the side plate, a clamping groove is formed in the side face of the side plate, a clamping block is arranged in the center of the clamping groove, a connecting plate is arranged at the bottom end in the clamping groove, and a bottom plate is connected to the side face of the connecting plate. According to the utility model, when the damage caused by the pressure of the clamping plates to the circuit board is reduced, when the clamping plates clamp the circuit board, the side plates move along with the clamping plates, then the connecting plates in the side plates are connected with the soft cushions in the connecting grooves, and under the action of the soft cushions, the direct contact pressure between the clamping plates and the circuit board is reduced; therefore, the damage to the circuit board caused by direct contact between the clamping plate and the circuit board can be reduced.

A gas processing system includes a vessel (102) defining a cavity (106) for processing a gas. The vessel includes a process gas inlet (108) for receiving a process gas at an input pressure and a process gas outlet (110) for discharging the process gas at an output pressure. The gas processing system also includes a shaft (122) coupled to the vessel and a stepwise sealing system (114) including a plurality of seals (136) spaced along the shaft. The shaft is configured to transfer mechanical energy to or from the gas in the vessel. Each adjacent pair of seals defines a corresponding pressure space therebetween. One of the pressure spaces is an equalization pressure space (144a) in hydraulic communication with the process gas inlet via a flow line (116) such that, in operation, a pressure in the equalization pressure space is maintained at an equalization pressure relative to a pressure in the process gas inlet.