Different types of valves for your propane cylinder and the heater are available but not every valve is fitted so well with various types of equipment.
Check out this list of valves.

I am Richard A. Jackson man behind propane heating solution, An HVAC expert working as a team lead of the heating department, Provide services all over the USA (around all major cities), and from planning to implementation, you will get all your solution here. We provide various tanks (propane and other natural gases) and deal with disposable waste.