1. As to  bi-directional  metal  seated  buttedly valve,there are different temperature levels, please  notify temperature when you  order goods.

2. As to electric bi-directional metal seated butterfly valve,there are two kinds:common type and explosion-proof.Users must notify when ordering.

3. As to worm gear operated butterfly valve,please notify in the contract if user needs bi-directional synchronic display.

4. When the users want to buy other bi-directional metal seated butterfly valves that are beyond operation types,specification,and  material,we  can 

    design specially,but users must notify when ordering.