Good question!

Our company named SILICONE VALVE SOLUTION CO.,LTD, WWW.SILICONEVALVE.COM is our website.
You do notice that our main product are silicone rubber valves.

Valves can be made of silicone or rubber material, which depends on different valve application. That's to say we can offer all silicone or rubber valves. 

Silicone Rubber Valve are also called

1) Silicone umbrella valve

2) Silicone one way valve

3) Silicone check valve

4) Silicone cross slit valve

5) Silicone duckbill check valve  

6) Silicone Dome valve