Abstract: A vehicle suspension damper is described. The vehicle suspension damper includes: a pilot valve assembly; a primary valve; and an adjuster, wherein the pilot valve assembly meters fluid to the primary valve, and the adjuster moves the primary valve.

Abstract: A shock absorber includes a damping force adjustment mechanism having a flow passage that allows the fluid from a cylinder, a valve seat, a valve body, and a stepper motor that adjusts a flow passage area by driving the valve body. A valve body position in which step-out may occur in the stepper motor if the valve body is moved further toward the valve seat therefrom is set as a step-out boundary position, a zone between a seated position in which the valve body is seated on the valve seat and the step-out boundary position is set as a step-out zone, and when the valve body is to be moved to the seated position through the step-out zone, the stepper motor is energized to move the valve body by a distance that is at least twice a distance to the seated position.

Abstract: A brake system for a vehicle includes brake cylinders operated by pressurized fluid for actuation of brakes by means of pressurized fluid on at least one first axle of the vehicle. The brakes on at least one other, second, axle can be actuated exclusively electromechanically in response to an electrical braking request signal. The pressure of the pressurized fluid can be modulated indirectly or directly and the electrical braking request signal can be generated indirectly or directly in response to actuation of a brake pedal of a brake pedal device. A service brake function is provided by means of hybrid use of the brakes on the first axle(s) together with the brakes on the second axle(s). The brake cylinders operated by pressurized fluid are pneumatically operated brake cylinders. The pressure modulated by the brake pedal device is a pneumatic pressure, and the pressurized fluid is compressed air.

Abstract: A shock absorber comprises a first cylinder including an inside bore; a piston dividing the inside bore of the first cylinder into a first chamber and a second chamber; a piston rod which extends within the first chamber; a second cylinder surrounding the first cylinder; a first connection passage arranged to connect the first chamber to a location outside of the shock absorber; a first tube member defining a second connection passage connected with the second chamber at the second end of the first cylinder; and a damping device comprising at least one valve element, the damping device being disposed between the second chamber and the second connection passage. The piston is configured to separate the first and second chambers so that the first and second chambers are not in fluid communication with each other through the piston.

Abstract: In a movement damping apparatus, a magnetorheological fluid is pressed through a flow path. A device generating a variable magnetic field comprises a core around which a coil is wound as well as pole surfaces in the flow path, the magnetic field acting on the magnetorheological fluid by means of said pole surfaces. The coil is arranged within the flow path along with the core, the axis of the coil extending perpendicular to the direction of flow of the magnetorheological fluid. The flow path has a jacket made of a magnetically conducting material.

Abstract: A vehicle suspension system that inhibits a pressure within a gas chamber from reducing below a threshold value. In one arrangement, the suspension system includes a shock absorber associated with a motorcycle. The shock absorber includes an upper gas chamber that is filled with air. An air pressure adjustment valve operates to supply air into the upper gas chamber from a supply of air outside of the shock absorber when the air pressure in the upper gas chamber becomes smaller than a lower threshold value.

Abstract: An electric suspension device includes a cylinder, a sub-tank, a first oil passage and a second oil passage, a damping force adjusting valve, and a damping force adjusting motor. The cylinder is rotatable about a mounting axis. The first oil passage connects a first inner oil chamber and an outer oil chamber. The second oil passage connects the first inner oil chamber of the cylinder and an oil chamber of the sub-tank. The first and second oil passages are disposed outside an inner tube and an outer tube, and share a portion with each other. The first and second oil passages are entirely disposed on the same side with respect to a reference plane.

Abstract: A suspension system includes a first suspension member movable relative to a second suspension member, a fluid reservoir having a volume, the volume variable in response to a relative movement between the first and second suspension members, and a fluid flow circuit having a first end in fluidic communication with the fluid reservoir and a second end in fluidic communication with an isolated suspension location, the fluid flow circuit comprising a first valve, a second valve and a third valve, wherein said first and third valves are in parallel with each other and the second valve is in series with each of the first and third valves.

Abstract: An adjustable rebound buffer includes: an outer perimeter, a central shaft hole and at least one adjustable hole. The outer perimeter is sized to fit inside a buffer cavity of the hydraulic damper. The central shaft hole is sized to fit around a damper shaft and position the adjustable rebound buffer on the damper shaft. The at least one adjustable hole provides an adjustable bleed path through the adjustable rebound buffer. A hydraulic damper with the adjustable rebound buffer includes the buffer cavity, wherein, the outer perimeter of the adjustable rebound buffer is adapted to fit inside the buffer cavity as the hydraulic damper approaches full extension.

Abstract: A hydraulic shock absorber includes a valve body having a second valve which is fixed to the valve body on a central axis CL side of the second valve and covers an open end of a second oil passage in the valve body. The second valve is deformable in a direction away from the valve body when the valve is applied with force from the valve body side. The second valve is configured: (a) to include a first through-hole formed in a circumferential direction thereof, (b) have lower stiffness, with respect to force from the valve body side, on a second through-hole side than on a third through-hole side and (c) such that a first corner portion C1 of the first through-hole has higher stiffness than a second corner portion C2 of the first through-hole positioned on the third through-hole side.

Abstract: A twin tube damper includes an inner fluid chamber, an outer fluid chamber in fluid communication with the inner fluid chamber and a first fluid circuit that is in fluid communication with the inner fluid chamber. The first fluid circuit includes a primary flow passage and a first bypass flow passage. A second fluid circuit is in fluid communication with the outer fluid chamber and with the first fluid circuit via a common flow passage. The second fluid circuit includes a primary flow passage and a second bypass flow passage. A switchable flow valve is provided for directing fluid flow between the first bypass flow passage and at least one of the common flow passage and the second bypass flow passage, and between the second bypass flow passage and at least one of the common flow passage and the first bypass flow control passage.

Abstract: A valve assembly of a shock absorber can achieve both an effect of varying an attenuation force according to a frequency region of vibration or shock transferred to the shock absorber during the driving of an automobile and an effect of varying an attenuation force according to an additional pressure and can increase the attenuation force in response to an instantaneous input of a large amplitude behavior. The valve assembly includes: a valve housing coupled to a piston rod having an orifice hole and a space formed therein, the space having an open lower end to communicate with the orifice hole; a frequency sensitive valve unit including a free piston configured to vertically partition the space; and a sub-valve unit coupled to the lower end of the space, wherein operation of the sub-valve unit is controlled by ascending and descending of the free piston.

Abstract: A vehicle suspension damper comprises a cylinder and a piston assembly including a damping piston along with working fluid within the cylinder. A bypass permits fluid to avoid dampening resistance of the damping piston. A fluid path through the bypass is controlled by a valve that is shifted by a piston surface when the contents of at least one predetermined volume is injected against the piston surface which acts upon the valve. In one embodiment, the bypass is remotely operable.

Abstract: A shock absorber has a compression valve assembly that provides a high damping load during a compression stroke and an extension valve assembly that provides a high damping load during an extension stroke. One or more digital valve assemblies is positioned to work in parallel with the compression valve assembly and the extension valve assembly to provide a lower damping load. The lowering of the damping load is based upon the cross sectional area of flow passages provided by the one or more digital valve assemblies.

Abstract: An adjustable damping valve arrangement for a vibration damper comprises an actuator which exerts an actuating force on an auxiliary valve body of an auxiliary valve. The auxiliary valve influences a closing force on a main stage valve. A pressure depending on the pressure level in a working space of the vibration damper acts on at least one pressure-impinged closing surface of the main stage valve via a flow connection. The flow connection is carried out so as to be functionally parallel to an incident flow of the main stage valve, and a flow-in opening of the flow connection is oriented at an angle of at least 60° to the flow direction into the main stage valve so that only a static pressure acts on the closing surface of the main stage valve.

Abstract: A gas spring capable of having long and short travel modes is described. The gas spring uses liquid in combination with pressurized air to affect the travel length. Unlike conventional gas springs, the gas spring according to the invention may have its travel reduced more than, for example, by 50%.

Abstract: An air bleed system for a suspension fork or shock absorber includes: a fluid passage between an interior of the suspension and an exterior of the suspension; and a manually operable valve having a first position substantially closing the fluid passage and a second position allowing fluid flow between the interior and the exterior.

Abstract: A piston connected to a piston rod is fitted in a cylinder having a hydraulic oil sealed therein. Flows of hydraulic oil induced by sliding movement of the piston are controlled by extension and compression damping force generating mechanisms and to generate damping force. In the extension damping force generating mechanism, the valve-opening pressure of a disk valve is controlled by the pressure in a back pressure chamber. An elastic seal member fixed to the disk valve is brought into sliding contact with an inner peripheral surface of a cylindrical portion of a valve member to seal the back pressure chamber. The disk valve is self-aligned by fitting between the elastic seal member and the inner peripheral surface of the valve member and secured by being axially clamped at an inner peripheral portion thereof in a state where a clearance is formed between the inner peripheral portion of the disk valve and a shaft portion of the piston rod, thereby reducing the requirements for coaxiality.

Abstract: A valve arrangement controls a main flow of damping medium in a shock absorber between two chambers. The valve arrangement has an actuator positioned in an actuator chamber that is in fluid communication with the two chambers. A pilot valve has a pilot chamber that is in fluid communication with the actuator chamber. A restrictor arrangement restricts flow from the actuator chamber to the pilot chamber. A sub-valve cooperating with the restrictor arrangement to control flow between two flow paths.

Abstract: A reduced noise decoupler has a perimeter with a wavy form. This provides a significant reduction in the initial contact noise. Hydraulic pressure deforms the wavy edges, pressing the wavy edge flat and creating the necessary seal. The edge geometry is created such that pressure will flatten the decoupler perimeter without creasing, ensuring a proper seal without losses. This is achieved by drawing the wavy detail from the perimeter to an interior of the decoupler body in alternating fashion to create a pattern of peaks and troughs bounded by thicker sections, allowing the edges to easily deform without creasing.

Abstract: A hydropneumatic telescopic strut includes a shock absorber having a damper cylinder filled with an incompressible damper fluid, a damper piston displaceable in the damper cylinder, and a damper piston rod. A gas pressure spring has a spring cylinder filled with a compressible suspension fluid and a spring piston arranged such that the spring piston is displaceable in the spring cylinder. The shock absorber and the gas pressure spring are connected in parallel with one another and the shock absorber and the gas pressure spring are movable telescopically upon spring deflection and rebound of the telescopic strut. An equalization reservoir is connected with the damper cylinder such that the damper fluid is provided for volume equalization of a time-variable displacement of the damper fluid by the damper piston rod upon spring deflection and rebound of the telescopic strut.

Abstract: A damping force controlling valve assembly for a shock absorber is provided. The damping force controlling valve assembly includes: a main body part of a retainer having an inlet passage connected to a high pressure side of the shock absorber; a main valve generating a damping force while resisting a working fluid flowing in through the inlet passage; a spool rod part interacting with a spool inserted thereinto and supplying a working fluid through a connection port to a back-pressure chamber provided at the rear of the main valve; a solenoid part controlling a position of the spool to adjust a pressure of the back-pressure chamber; and an auxiliary valve disposed at an upstream of the main valve to generate a damping force in an extremely low speed section in advance of the main valve.

Abstract: A fluid pressure shock absorber in which valve opening of the main valve is controlled by an inner pressure of a backpressure chamber. A first piston (3) and a second piston (4) coupled to a piston rod (10) are fitted in a cylinder (2) such that a piston chamber (2C) is defined between the first and second pistons. An extension-side main valve (18) and a compression-side main valve (23) are provided in the piston chamber (2C). Valve opening of the main valves is controlled by an extension-side backpressure chamber (19) and a compression-side backpressure chamber (24). A compression-side check valve (13) and an extension-side check valve (16) are provided at the first piston (3) and the second piston (4). During an extension stroke of the piston rod (10), the compression-side check valve (13) is closed, whereby action of a pressure of a cylinder upper chamber (2A) on the compression-side main valve (23) is prevented.

Abstract: A vehicle damper comprises a fluid filled cylinder, a piston for movement within the cylinder, at least two fluid ports formed in the piston and at least one shim at least partially blocking the ports. In one embodiment, a fluid collection area is formed between the ports and the shim, the collection area permitting communication between fluid in the ports. In another embodiment, the piston includes at least one aperture constructed and arranged to receive a threaded bleed valve.

Abstract: A valve for a suspension damping system having a valve body and a shim valve assembly that permits fluid flow in two directions. The valve body separates a first fluid chamber from a second fluid chamber and has at least one fluid port therethrough between the first and second chambers. The shim valve assembly is coupled to the valve body and configured to control fluid flow across the valve body. The shim valve assembly includes a first shim having at least one fluid port and a second shim configured to seal the first shim fluid port. The first and second shims are flexible in a first direction under fluid pressure to permit fluid flow between the first and second fluid chambers, providing a first resistance to fluid flow. The second shim seals fluid flow through the first shim fluid port during flow in the first direction. The second shim is flexible in a second direction under fluid pressure to permit fluid flow between first and second fluid chambers, providing a second resistance to fluid flow.

Abstract: A front fork for easily optimizing an oil quantity in a damper cylinder with a relatively simple structure without affecting operability of a free piston even in an assembled state. An escape portion is formed on an outer periphery of a piston rod at a position where a seal member mounted on a sealing cap faces in an opposed manner when a front fork extends to the maximum.

Abstract: The present disclosure provides improved linkage assemblies for use with drilling rig and mobile well servicing rig braking systems, and braking systems comprising such improved linkage assemblies. The disclosed improved linkage braking assemblies effectively decouple the emergency brake actuation cylinder shaft and the brake lever upon activation of the emergency brake actuation cylinder, thereby preventing the brake lever from rapid and forceful downward movement, which could injure the operator.

Abstract: A cushion device includes a shock absorber and an accumulator. As a piston moves in a certain direction in a cylinder so that the shock absorber is compressed, oil in an oil chamber is discharged to the accumulator through an oil hose. The compression operation of the piston allows a slide member to slide and the capacity of an oil chamber is reduced. The oil in the oil chamber is discharged to a regulation unit through an oil hose. The regulation unit controls a valve by the pressure of the oil coming in from the oil chamber and applies resistance to the oil discharged from an oil chamber to an oil chamber.

Abstract: A shock absorber having a valve controlling the flow rate of fluid between a compression chamber and a rebound chamber in a housing and separated by a piston. The valve has an orifice component and a blocker component, one of which has a permanent magnet, and the other of which has a magnetically permeable material. Upon the application of sufficient fluid pressure, the blocker component is forced away from the orifice component, despite the magnetic bias that tends to attract the two structures. Because the magnetic force decreases as the two components are spaced farther apart, the shock absorber has excellent performance characteristics. Alternatively, a mechanical spring urges the blocker closed, and magnetic attraction between the blocker and a spaced opener mitigates the increased force of the compressed spring tending to close the valve.

Abstract: A gas spring curve control valve for a adjustable-volume gas-pressurized device is described. The valve allows for selection from among at least four spring curves and can be packaged in small spaces/devices. In an exemplary embodiment of the invention, a rotary cam having grooves and lobes that interact with spring loaded ball bearings and an external adjuster knob are used to easily change the gas spring curve “on-the-fly” and with minimal user effort.

Abstract: A metering pin assembly, for use in an aircraft landing gear shock absorber, that is operable to move within the shock absorber, independently of the shock absorber, to respond to movement of the landing gear under subjected load.

Abstract: A suspension component achieves progressive resistance via a secondary bleed valve, which functions as a support for the primary compression valve at higher displacements, in conjunction with a secondary nonlinear spring element configured to alter the force on the piston at high displacements.

Abstract: The flow of hydraulic fluid induced by sliding movement of a piston in a cylinder is controlled by a pilot-type main valve and a pilot valve to generate damping force. The valve opening of the main valve is controlled by adjusting the pressure in a pilot chamber through the pilot valve. A volume compensating chamber is defined by a flexible disk member so as to face the pilot chamber. The volume compensating chamber is communicated with a reservoir through communicating passages. When the disk valve opens, the volumetric capacity of the pilot chamber reduces. At this time, the flexible disk member deflects toward the volume compensating chamber, thereby suppressing an excessive rise in pressure in the pilot chamber and preventing an unstable operation of the pilot valve and the main valve to obtain a stable damping force.

Abstract: In a joint structure for joining an insertion shaft that is driven to rotate to a reception side shaft having an insertion groove into which the insertion shaft is inserted so that a rotation of the insertion shaft is transmitted to the reception side shaft, a plurality of pairs of opposing side face portions are formed on an outer periphery of the insertion shaft, the insertion groove includes an axial hole that is formed to open onto an end surface of the reception side shaft and coincides with a pair of first side face portions of the side face portions, and a radial hole that is formed to penetrate the reception side shaft in a radial direction and coincides with a pair of second side face portions of the side face portions, and the axial hole and the radial hole are formed such that respective parts thereof intersect.

Abstract: A valve (1) comprises a spring arrangement comprising a stiff (5) and a weak spring (6). The weak spring (6) has the form of a thin, circular disc having a first spring surface (6?) and a second spring surface (6?), and an inner spring part (6a) and an outer spring part (6b) substantially separated from each other with cavities (6c), yet at two points, at least, connected with legs (6d). The effect of the connection is that the outer spring part (6b) and the inner spring part (6a) can deflect in relation to each other.

Abstract: An adjustable damping valve device for a vibration damper includes a housing with an axially movable valve body. The valve body has in the direction of a valve seat surface a pressure-loaded surface AOED which is operative in the lift direction of the valve body and a surface ACloseD which is loaded by pressure in the closing direction, wherein a resultant force comprising a force of at least one valve spring and an actuating force of an actuator acts on the valve body, and wherein an additional surface ACloseD2 of the valve body is pressure loaded by damping medium in closing direction of the valve body. The damping valve device has an emergency operation valve by means of which a pressure level can be at least indirectly adjusted in a control space for an emergency operation. The emergency operation valve is operative only in one flow direction.

Abstract: A damping valve comprises a through-hole forming a passage for a working fluid. A poppet having a center axis is seated on a valve seat around the through-hole. The poppet is housed in a housing so as to be free to slide along the center axis. The poppet is pressed against one wall surface of the housing by a biasing mechanism, that biases the poppet in a direction perpendicular to the center axis, vibration of the poppet is thereby suppressed.

Abstract: The invention relates to a flow-control valve (1) for a hydraulic shock absorber. Components of the basic structure of the flow-control valve (I) are an axially movable slide (5) having a body (6) and a valve sleeve (7), an electromagnetic linear actuator (8) for axial displacement of the slide (5) and a fixed guide body (9) configured as a tube and having an end pin (10). The valve sleeve (7) is guided on the end pin (10) of the guide body (9) and cooperates with at least one valve opening (11) formed in the wall of the guide body (9) such that the flow cross section of the valve opening (11) can be altered by axial movement of the valve body (7). According to the invention the slide (5) is provided in a pole tube (12) fixed on the guide body (9). The body (6) of the slide (5) is guided with a clearance fit in a bearing ring (13) attached to a section of the pole tube (12) surrounding the body (6).

Abstract: The vibration damper with an adjustable damping force includes a cylinder filled with a damping medium, a piston rod axially movable in the cylinder and carrying a piston which divides the cylinder into a first working space on the piston rod side and a second working space on the side away from the piston rod, a first adjustable damping valve which is connected to at least one of the two working spaces by means of a fluid connection, at least one second valve which is connected hydraulically in parallel to the first adjustable damping valve, and a third damping valve arranged in series to and upstream from both the first and second valves, the third damping valve moving in a closing direction as a function of a flow velocity of the damping medium through the third damping valve.

Abstract: The control valve is applied to a shock absorber, which comprises: a pressure tube (10); a piston (14) dividing the pressure tube (10) in compression and traction chambers (CC, CT) communicating with each other through the piston (14); a hydraulic fluid reservoir (20) provided with a selective bidirectional fluid communication with the compressor chamber (CC). The control valve (VC) communicates the traction chamber (CT) with the reservoir (20) and comprises a tubular body (40) provided with at least one radial passage (41) opened to the interior of the tubular body (40) and to the reservoir (20); a shutter pin (60) to be axially displaced within the tubular body (40), between a closing position and different open positions of the control valve (VC) for communicating the traction chamber (CT) with the reservoir (20); and an actuator means (A) for axially displace the shutter pin within the tubular body (40).

Abstract: A fluid flow control structure for a bicycle device is basically provided with a main body, at least one port and a plug. The main body has a first chamber, a second chamber and a third chamber. The at least one port is in fluid communication with the first chamber. The plug is moved toward a first axial direction to close the port, and is moved toward a second axial direction that is opposite the first axial direction to open the port. The plug includes a dividing portion dividing the second chamber and the third chamber such that the third chamber widens as the plug moves to close the port and the third chamber shrinks as the plug moves to open the port. The plug includes a passage fluidly connecting the first chamber to the third chamber.

Abstract: A damper for a bicycle having, in one arrangement, a primary unit and a remote unit. The primary unit includes a damper tube, a spring chamber, and a piston rod that supports a main piston. The main piston is movable within the damper chamber of the primary unit. The main piston and the damper tube at least partially define a compression chamber. The remote unit comprises a remote fluid chamber and an inertial valve within the remote unit. The inertial valve is preferably responsive to terrain-induced forces and preferably not responsive to rider-induced forces when the shock absorber is assembled to the bicycle. A fluid flow control arrangement within the remote unit utilizes compression fluid flow to delay closing of the inertial valve after acceleration forces acting on the inertial valve diminish. In some arrangements, the inertial valve and fluid flow control arrangement may reside in the primary unit.

Abstract: A leaf valve structure according to this invention comprises an annular valve seat, and a leaf that is seated on the valve seat under a predetermined elastic supporting force against a pressure of a working fluid on an inner side of the valve seat. A recessed depression portion having an opening portion on both an inner periphery of the valve seat and a seating surface of the leaf is formed in the valve seat, thereby creating a site where the pressure of the working fluid on the inner side of the valve seat can act more easily on a seating surface between the valve seat and the leaf valve. Accordingly, an effect of a surface adsorption force applied to the leaf valve by the valve seat on a cracking pressure can be suppressed, and as a result, the leaf valve can be lifted under a stable cracking pressure.

Abstract: A hydraulic damper assembly includes a main body, a shaft assembly and a main piston operatively configured to define an upper portion and a lower portion within the main body. A hydraulic damper spool valve is adapted to provide a single path, variable hydraulic flow restriction between the upper portion and lower portion of the main body. The hydraulic damper spool valve is configured with an array of precisely shaped flow apertures that are proportionally opened and closed by a pair of valve spools in response to the pressure differential across the main piston. The damper's pressure-flow operating characteristic is simply and predictably dictated by the geometric configuration of the shaped flow apertures. The precisely defined open area of the shaped flow apertures provides a mathematically predictable hydraulic flow restriction that operates predominately in a turbulent regime resulting in insensitivity to hydraulic fluid viscosity and consequently temperature change.

Abstract: An amplitude selective shock absorber includes a cylinder, a piston rod axially movable within the cylinder, a stationary piston valve fixedly mounted on the piston rod to divide a space of the cylinder into a rebound chamber and a compression chamber, a floating piston valve mounted on the piston rod to be movable in an axial direction in the rebound chamber, a stopper secured to the piston rod above the floating piston valve, and frustoconical leaf springs disposed between the floating piston valve and the stationary piston valve and between the floating piston valve and the stopper, respectively.

Abstract: A valve assembly for a shock absorber includes a valve body defining a fluid passage. A valve disc engages the valve body to close the fluid passage. A fulcrum disc engages the valve disc at a first position and a second position radially outward from the first position. The fulcrum disc is designed such that the second position is closer to the valve body. In one embodiment, the fulcrum disc is concave with respect to the valve body.

Abstract: A pressure regulator is provided for adjusting a pressure in a hydraulic flow, which pressure can be at least partially regulated using a solenoid. The solenoid can adjust a position of a driver that comprises a solenoid armature, a solenoid armature rod, and a delimiting part. The solenoid armature can be arranged around a solenoid armature rod and can be axially displaceable inside a solenoid chamber in a housing. The solenoid armature rod can have one or more holes that fluidly interconnect a first chamber to a solenoid chamber of the regulator. The delimiting part can be arranged around the solenoid armature rod adjacent to the housing and be configured such that clearances between the delimiting part, the solenoid armature rod, and the housing enable a certain radial movement between the driver and the housing.

Abstract: A damping force variable valve includes a retainer having a main body connected at a central portion thereof to a high pressure part or portion of a shock absorber and having an outer peripheral region enlarging outwardly, and a spool rod integrally extending from the central portion and formed at a center thereof with a hollow portion having a spool inserted therein. The variable valve further includes a main disc disposed adjacent the retainer, a solenoid unit provided adjacent the spool rod and including a push rod for moving the spool when electrical power is applied, and an operating block installed adjacent the solenoid unit and including an enlarged portion coupled to the outer peripheral region of the main body.

Abstract: The present disclosure provides improved linkage assemblies for use with drilling rig and mobile well servicing rig braking systems, and braking systems comprising such improved linkage assemblies. The disclosed improved linkage braking assemblies effectively decouple the emergency brake actuation cylinder shaft and the brake lever upon activation of the emergency brake actuation cylinder, thereby preventing the brake lever from rapid and forceful downward movement, which could injure the operator.

Abstract: An adjustable damping valve including an actuator, which exerts an actuating force on a valve body against the force of a spring to influence the throttle cross section which determines the damping force, where an emergency valve is connected in parallel with the throttle cross section with respect to the flow direction of the damping medium, where the two control surfaces of the valve body move in the axial direction and can thus can come to rest alternately on the two valve seating surfaces, and where the valve body is divided into two parts in the longitudinal direction, and each valve body assembly has its own control surface.