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Replacment Valves and Bafflers on Kriebel System

Have a Kriebel 2 pipe Vacuum Vapor steam system in a house I just bought. 2 radiators were missing, 2 more leaking of 12 total. Removed 2 leaking radiators and capped pipes temporarily to get heat and system seems to work well. All radiators warm and no water hammer, not short cycling. Have a line on some replacement radiators but valves and bafflers are my issue. I have the valves and bafflers from the 2 bad radiators, but nothing for the two that were missing when I bought the property. Need some good advice:

1. Can I use a regular Home Depot variety steam valves or other readily available valves on the supply side? The original valves are Phila Vacuum-Vapor company ones but do not look to be doing anything special inside?

2. On the returns, are there sources for the baffler type elbows? Web searches did not turn up anything on first glance. If not, can I use traps of different construction on the replacement radiators in the system and have it function properly?

Chris in Emmaus, PA