Operating Principle of a Four-Way Ball Valve
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The manual operating section may be equipped with either a stamped steel handle or a cast stainless steel handle. The handle is fitted with a travel stop mechanism that defines the fully open and fully closed positions of the valve.
When the valve is installed in critical service, the stop plate is provided with a locking hole to secure the handle position and prevent unintended operation. Clear open and close markings are provided on the handle.
The valve stem is integrally forged from A182 F material and undergoes heat treatment, achieving a hardness of HB220–250. The stem connects to the handle via a flat key, spline, or square drive, providing high versatility and ease of assembly and disassembly.
A blow-out proof design is incorporated into the stem for enhanced safety.
The valve packing can be made of braided packing, flexible graphite seals, or PTFE seals, ensuring reliable stem sealing under adequate lubrication.
If required, the ball valve can be designed with an anti-static structure. Conductive springs are installed between the ball and stem, and between the stem and valve body, to prevent static discharge from igniting flammable media, thereby enhancing system safety.
The sealing pair comes in various configurations. Depending on the service conditions, soft seals, metal-to-metal hard seals, or fire-safe seat designs can be selected. Valves with nominal sizes below DN150 use a floating ball design, while those below DN200 employ a trunnion-mounted ball design.
Auxiliary sealing structures can be provided at the valve seat. Grease injection valves can be installed at the seat and stem locations to provide temporary sealing in emergency situations. The valve stem can also be extended as required to accommodate buried or recessed installations.
When the valve is installed in critical service, the stop plate is provided with a locking hole to secure the handle position and prevent unintended operation. Clear open and close markings are provided on the handle.
The valve stem is integrally forged from A182 F material and undergoes heat treatment, achieving a hardness of HB220–250. The stem connects to the handle via a flat key, spline, or square drive, providing high versatility and ease of assembly and disassembly.
A blow-out proof design is incorporated into the stem for enhanced safety.
The valve packing can be made of braided packing, flexible graphite seals, or PTFE seals, ensuring reliable stem sealing under adequate lubrication.
If required, the ball valve can be designed with an anti-static structure. Conductive springs are installed between the ball and stem, and between the stem and valve body, to prevent static discharge from igniting flammable media, thereby enhancing system safety.
The sealing pair comes in various configurations. Depending on the service conditions, soft seals, metal-to-metal hard seals, or fire-safe seat designs can be selected. Valves with nominal sizes below DN150 use a floating ball design, while those below DN200 employ a trunnion-mounted ball design.
Auxiliary sealing structures can be provided at the valve seat. Grease injection valves can be installed at the seat and stem locations to provide temporary sealing in emergency situations. The valve stem can also be extended as required to accommodate buried or recessed installations.
