Using SimHydraulics

Wondering if anyone can help? I am trying to create a simulation on simulink using simhydraulics in order to allow airflow into an airbag (reservoir) an maintain it at a maximum level of psi. Just wondering if anyone had any idea to what valves I should be looking at? I will be using a pressure reducing valve in order to maintain the maximum air capacity. Also is there anyway of controlling valves through the use of simulink?

Thanks