D-22 Service Portion blanking plate. Photo by E. Wilde, 2020 Sep 25.

When the D-22 Service Portion of the brake valve is removed to be sent to the air brake shop for servicing, during a COT&S, the pipe bracket is left open to the air. It's an irresistable invitation to the wasps, spiders, blowing dust and rain, to make themselves at home. We prefer to blank off the pipe bracket with a blanking plate fabricated from a piece of 1/4" steel. This thickness of plate gives a good, solid seal against the machined surface of the pipe bracket and can be bolted up tightly, to make sure that nothing gets inside to contaminate the brake system. Photo by E. Wilde, 2020 Sep 25.

D-22 Service Portion gasket. Photo by E. Wilde, 2020 Sep 25.

If you remove the brake valve carefully, you can save the old gasket to use with the blanking plate. We keep one that we saved years ago for this use, along with the blanking plate. Alternately you can fabricate a gasket for the blanking plate out of some 1/8" or 1/4", 60-duro neoprene sheet or a piece of 1/8" rubberized cork gasket material. It's only to seal the blanking plate, not hold 110 pounds of air. Photo by Eric Wilde, 2020 Sep 25.

D-22 Emergency Portion blanking plate. Photo by E. Wilde, 2020 Sep 25.

Another use for the old gasket is to lay out the blanking plate on the 1/4" thick steel plate. The holes have to line up with the threaded holes in the pipe bracket and tracing the gasket holes sure beats measuring. Shown is the blanking plate for a D-22 Emergency Portion. Photo by Eric Wilde, 2020 Sep 25.

Decelostat and Relay Valve blanking plates. Photo by E. Wilde, 2020 Sep 25.

A number of other blanking plates, for things like Decelostats and the Relay Valve are needed. The Decelostat gaskets are a tricky, two-piece item so it is best to reuse an old one when blanking them. All of the blanking plates, etc. are painted bright red and marked for use. Hopefully, the red will prevent you from forgetting to remove one and put the valves back the way they are supposed to go. Photo by Eric Wilde, 2020 Sep 25.

Reverse side of blanking plate. Photo by E. Wilde, 2020 Sep 25.   Pipe flange blanking plates. Photo by E. Wilde, 2020 Sep 25.

Rubberized cork gasket, 1/8" thick, works well for a blanking plate gasket, if you can't save the old gasket from your brake valve, or if it is too chewed up to seal.

A bunch of standard pipe flange blanking plates, made from 1/16" steel sheet, should be on hand to blank off any pipe flanges that are separated. We use 1/2" washers on all of the pipe flange blanking plates, along with 1/8" rubberized cork gaskets. Be sure to remove the square o-ring from the pipe flange, so that the cork gasket will seal the whole, machined surface. You'll be replacing all of these o-rings, anyway. Photo by E. Wilde, 2020 Sep 25.