Double-d stem head is designed to ensure correct mounting of handle，which always flows in the same direction as the switch position.

Reliable flow lock device.The valve is equipped with integral structure locking device to fix the flow direction and limit unauthorized operation.

Blowout proof stem design.The bottom of the stem is designed with T-shaped and integral lug on the valve body to ensure that the stem is not blown out by pressure.

Anti-static device: spring ground plug is used to ensure that the valve stem，ball and valve body form a conduction path to avoid static electricity accumulation.

Fireproof design. The metal-to-metal seal can be used to cut off the valve fluid after the non-metallic seal material is damaged by fire.

Body cover bolted structure，using the nut to ensure perfect sealing performance.