Brake cylinder leakage test method and device
First Claim
1. A method of leakage testing of a brake cylinder on a rail car having a brake pipe and having a brake control valve in communication with the brake cylinder, the method comprising:
- charging the brake pipe;
discharging the brake pipe at least at a service rate thereby actuating the brakes by charging the brake cylinder;
simultaneously with charging the brake cylinder, charging a reference volume to the brake cylinder pressure;
terminating the discharging of the brake pipe;
maintaining the pressure in the reference volume; and
measuring a difference between the pressure in the brake cylinder and the pressure in the reference volume a fixed period after beginning the maintaining of the pressure in the reference volume to determine an amount of leakage.
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Accused Products
Abstract
A test device and a method of testing leakage of a brake cylinder on a railroad car having a brake pipe and brake valve. The method includes charging the brake pipe, discharging the brake pipe at least at a service rate to actuate the brakes by charging the brake cylinder and simultaneously with charging the brake cylinder charging a reference volume to the brake cylinder pressure. Discharging of the brake pipe is terminated and the pressure in the reference volume is maintained. The difference of pressure between the brake cylinder and the reference volume, at a fixed period after the beginning of maintaining the pressure in the reference volume, is measured to determine the leakage.
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Citations
36 Claims
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1. A method of leakage testing of a brake cylinder on a rail car having a brake pipe and having a brake control valve in communication with the brake cylinder, the method comprising:
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charging the brake pipe; discharging the brake pipe at least at a service rate thereby actuating the brakes by charging the brake cylinder; simultaneously with charging the brake cylinder, charging a reference volume to the brake cylinder pressure; terminating the discharging of the brake pipe; maintaining the pressure in the reference volume; and measuring a difference between the pressure in the brake cylinder and the pressure in the reference volume a fixed period after beginning the maintaining of the pressure in the reference volume to determine an amount of leakage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A leakage tester for a brake cylinder on a rail car having a brake pipe and having a brake control valve in communication with a brake cylinder, the tester comprising:
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a housing having a source port, a brake pipe port and a brake cylinder port; a first valve connected to the source port and the brake pipe port and controlling the charging and discharging of the brake pipe; a reference volume; a second valve connected to the brake cylinder port and the reference volume and controlling the interconnection of the brake cylinder port and the reference volume; a timer set to a fixed period; a first sensor connected to the reference volume and the brake cylinder port to determine a difference between pressure in the reference volume and the pressure at the brake cylinder port; and a first indicator connected to the first sensor and the timer and indicating pass/fail after expiration of the period. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification