The h in ball valve q347h indicates that the sealing surface material is Cr13 stainless steel.

According to the standard provisions of "JBT 308-2004 Valve Model Preparation Method":

Q==Ball valve

3==Transmission mode: worm gear

4==Connection method: flange connection

7==Structural form: straight flow channel fixed ball

H==Sealing surface material: Cr13 series stainless steel