2 way plug valve Description
Two-way plug valve is a valve that can be opened or closed by rotating the valve plug 90 degrees to connect or separate the channel opening on the valve body. The valve plug can be cylindrical or conical.
Structure and working principle
Main components
Valve body and valve cover: Casting process (cast iron, cast steel or stainless steel) is adopted, and the internal flow channel is a straight-through design;
Plug (valve core): Cylindrical or conical structure, with a rectangular/trapezoidal channel in the center, and the medium is controlled by 90° rotation;
Sealing system: Fluororubber or PTFE sealing ring is embedded in the surface of the valve plug to form a soft seal with the valve body; some models are equipped with hard alloy coating to enhance wear resistance;
Operating mechanism: The handle or handwheel drives the valve stem to drive the plug to rotate accurately (some with opening indication).
Workflow
Open: The plug channel is aligned with the pipeline, and the medium passes in a straight line (flow resistance loss ≤ 30% of conventional valves); Close: The plug rotates 90°, the channel vertically cuts off the medium, and the sealing surface is pressed to achieve zero leakage.
2 way plug valve Specification
| Parameter | Scope/Type |
|---|---|
| Nominal diameter | DN15～DN300 (conventional DN50-DN200) |
| Pressure Level | PN10～PN100(Class 150～600) |
| Temperature range | -20℃～200℃(Fluororubber seal) |
| Connection method | Flange, thread (internal/external thread such as M20×1.5, ZG1/2") |
| Parts | Material | Features |
|---|---|---|
| Valve body | Cast iron (conventional), cast steel (high pressure), stainless steel (304/316L) | Corrosion resistance/high compressive strength |
| Plug | Same material as valve body or chrome-plated | Reduce friction and wear |
| Sealing ring | PTFE, fluororubber, graphite reinforced composite materials | Chemical resistance/high temperature stability |
| Filler | Graphite Packing, Flexible Graphite | Leakage-proof, high temperature resistant |
2 way plug valve
Advantages
Efficient operation: 90° rotation for fast opening and closing (response time < 1 second), suitable for frequent operation scenarios; Low flow resistance design: small pressure loss in straight-through flow channel, improving pipeline transportation efficiency; Reliable sealing: soft and hard seal combination, leakage rate ≤ 0.01% (in line with ISO 5208 Class A); Flexible installation: supports installation in any flow direction, not restricted by pipeline direction; Easy maintenance: modular seals can be replaced online to reduce downtime.
Industry applications and specific functions
1. Petrochemical
Scenario: crude oil pipeline, reactor feed control; Function: quickly cut off particle-containing media (such as oil slurry) to prevent valve jamming.
2. Energy and gas
Scenario: natural gas pressure regulating station, LNG tank inlet and outlet; Function: cooperate with pressure gauge to achieve safe pressure relief (such as two-way pressure gauge plug valve).
3. Pharmaceutical and food
Scenario: sanitary pipelines, corrosive agent delivery;
Function: stainless steel valve body + PTFE seal meets aseptic requirements and prevents medium contamination.
4. Environmental protection and municipal administration
Scenario: sewage treatment plant, HVAC system;
Function: thermal insulation plug valve (jacket design) prevents low-temperature medium crystallization and blockage.
5. Industrial general
Scenario: mechanical equipment lubrication system, compressed air pipeline;
Function: high-frequency opening and closing to control flow, replacing traditional gate valves/ball valves.
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