Selection of valve is very important in the petroleum industry. An incorrect selection of valve may cause a loss of income, pollution of environment, and an increase of maintenance costs. 3Z double block-and-bleed valve was designed to withstand frequent cycling and provide a tight seal shutoff, and used in metering stations, tank farms, marine loading docks, air port and blending plants.

3Z Double Block and Bleed valve is designed that the seals do not come into contact with the valve body while operating. The seals come into contact with the body at the last moment of closing. This design eliminates abrasion of the seals and extends seal life without leakage.

3Z Double Block and Bleed valve is possible to inspect and replace the sealing slips on the pipe line. Bolted bottom cover can be disassembled to replace the sealing slips on the pipe line.

3Z double block-and-bleed plug valves are designed to operate by hand wheel, gear or actuator. 3Z valves can supply variable operators as per customer`s requirements.

are designed for the rigid requirements of bi-directional meter proving which especially requires the valve to be cycled hundreds of times per day and has a short cycling time around 10 seconds during valve operation.

3Z 4-way diverter valves supply special low differential pressure device systems with pressure gauge to proof seal integrity and to make low differential pressure (2~5psi) between the upstream and the body cavity for the purpose of flow diverting at short cycling time required by meter proving systems.