摘要:
A pneumatic pressure control device for an empty/load changeover valve on a railway car, which enables an empty/load changeover valve to have a lower profile. The pneumatic pressure control device comprises a mounting member having a first surface, a second surface, and further having an actuating push rod. A sensor arm of a predetermined size and shape has a first end and a second end. A first disposed adjacent at least one of the first surface and the second surface of the mounting member pivotally supports the sensor arm in a predetermined position on the mounting member. A second is engageable with the sensor arm and the actuating push rod on the mounting member for moving the push rod in response to a movement of the sensor arm. A load sensing has at least a portion thereof disposed on the second end of the sensor arm for determining a rate of brake cylinder pressure required relative to an actual weight of a railway car. The sensor arm and the load sensing have a predetermined travel limit.
摘要:
An empty/load brake control system mountable on a sprung and an unsprung member of a railway car and disposed between the car brake control valve and brake cylinder for adjusting the brake cylinder pressure during a brake application according to the car load condition. Such system includes an empty/load sensor valve device and a sensor arm coupled to a sensor cable whose movement is controlled by a sprung member and a terminal member disposed on an end of sensor cable, in contact with sprung member so that any downward movement of sprung member forces such terminal member in a similar downward direction and similarly pulls on the sensor cable. A piston, under pressure, urges the sensor arm to rotate and retract sensor cable but must overcome resistance of a spring. The system includes a load proportional valve.
摘要:
A dual valve fitting enables pressure within a housing to be quickly measured. The fitting defines a passage between its threaded and protuberant ends. The threaded end screws into the housing. In an upper section of the passage, a first valve atop a valve stem features a poppet head that is seatable against an outer valve seat. A first biasing mechanism compels the head against the outer seat to keep the first valve normally closed. In a lower section of the passage, a second valve features a seat piece and a valve retainer. On its periphery, the seat piece carries an o-ring which sealingly secures the piece within the passage. The piece defines an inner bore between its ends and has an inner valve seat on its bottom. The top of the retainer is extendable through this inner bore to a point a dead space apart from a bottom of the stem. Around its bottom, the retainer carries an annular check valve. A second biasing mechanism acts upon the retainer so that the check valve seats against the inner seat thereby rendering the second valve normally closed. When a female coupler of a quick connect device is mated to the protuberant end, it causes the stem to move inwardly so that its head unseats from the outer seat and its bottom moves through the dead space and pushes the retainer to unseat the check valve. This enables air to flow the housing through the fitting into the female coupler.
摘要:
A dual seal coupling apparatus enables quick measurement of brake cylinder pressure through a receiver assembly of a control valve. The receiver assembly has a receiver body, a check valve housed in the body and a cover whose removal renders the check valve accessible. The check valve is normally compressed against a check valve seat to provide a first seal that prevents leakage of the pressure. When moved away from its seat, the check valve provides access to the pressure. The apparatus includes a boss that protrudes from the cover and a male portion of a quick connect coupling. The boss defines a threaded bore aligned with the check valve when the cover is secured to the receiver body. The male portion includes a valve body and a valve stem. The valve body defines a valve bore and has a threaded end for screwing into the threaded bore of the cover. At its opposite end, the valve body is shaped to mate with a female portion of the quick connect coupling. The valve stem moves within the bores and its head is normally compressed against a valve stem seat. The head of the valve stem against the valve stem seat provides a second seal that further prevents leakage of the pressure. When the male and female portions are mated, the valve stem is moved away from its seat thereby moving the check valve away from its seat and providing access to and enabling measurement of the brake cylinder pressure.
摘要:
A pneumatic receptacle adapted to receive a pneumatic connector head of a test device is mounted in a universal location remote from the brake control valve of a railroad freight car. The remotely mounted receptacle may be located on the railroad car body, for example, and is communicated with access ports associated with the control valve via hoses or conduits. In locating the receptacle on the car body, hook-up of the test device can be accomplished conveniently and in a safe manner by railroad personnel in the course of conducting a single car test to check the condition of the car brakes, regardless of the control valve location.
摘要:
A two-piece check valve device comprising a rubber sealing element and a plastic carrier member. A through bore in the plastic carrier member receives the sealing element, which is formed with an annular groove in which the carrier member is removably secured. The through bore and annular groove may be correspondingly tapered to facilitate assembly and disassembly of the check valve device.
摘要:
An improved hose coupling gasket in which the standard gasket retaining flange is modified to include an additional sealing bead strategically formed on the upper surface of the flange such as to engage the adjacent surface of the gasket retaining groove in the coupling head. The diameter of this additional sealing bead is such that the point of engagement between the sealing bead and retaining groove corresponds to a gage point where the dimensional accuracy of the retaining groove width is checked in accordance with A.A.R. requirements.
摘要:
A diaphragm piston assembly in which an annular ring member is provided, preferably at the outer clamping periphery of the diaphragm between the underside of the diaphragm and body, to exert a force on the diaphragm in the direction of the cover that clamps the diaphragm to the body, thereby encouraging the diaphragm convolution to assume a disposition in a preferred direction corresponding to the direction in which the convolution is predisposed by the inherent "spring effect" of the diaphragm.
摘要:
A diaphragm clamping arrangement for assembly of a diaphragm-type piston in the body of a valve device or the like such that the diaphragm is biased in a direction to cause the diaphragm convolution to assume a preferred disposition in which a desired diaphragm "spring effect" is maintained.
摘要:
A spring-locking handle mechanism in which a flat piece of spring stock is formed in a generally U-shaped configuration to provide a locking spring, one leg of which bears against the underside of the socket portion of a conventional two-piece locking handle, and the other leg of which bears downwardly on the upper surface of the handle portion. The spring legs must be spread apart in order to assemble the spring with the handle mechanism and are thus normally under tension, so that the handle portion is biased in its downward or locking position relative to the socket portion to discourage unintentional lifting. The width of the one leg corresponds to the distance between the depending locking lugs on the handle portion so as to fit snugly therebetween in both the locked and unlocked position of the handle. When the handle is raised to its unlocked position and then turned, the locking lugs engaging the sides of the one spring leg assure that the spring turns with the handle to maintain a spring load on the handle throughout the handle operating range of rotation.