1. The handwheel, the handle and the transmission mechanism are not permitted to be lifted, and the collision is strictly prohibited.
2. Double Gate valves shall be mounted vertically (i.e. the stem is positioned vertically, handwheel at the top).
3. Valve with by-pass valve should open the by-pass valve before opening (to balance the pressure difference of import and export and reduce the opening force).
4. Valve with transmission mechanism, according to the specification of the product use.
5. If the valve is often switched on, lubricate at least once a month.