What is Lubricated Plug Valve ?
In order to reduce the friction of the lubricated plug valve body and the plug sealing surface, the valve generally adopts a sealing structure of sealing grease lubrication of the valve seat. The high-pressure sealing oil injected from the high-pressure oil nozzle forms a high-pressure sealing ring around the plug, that is, there is an oil film between the valve body and the sealing surface of the plug cone, which can be closed and lubricated, and it is easy to open and close. The mounting mode of the cock cone is formal.
Advantages of lubricated plug valve
- 01The plug valve is sealed by the cone surface, with a large sealing contact surface, and the oil film plays a role of lubrication and sealing.
- 02The valve cover at the bottom of the valve body is equipped with an adjustment support to adjust the position of the valve core.
- 03The valve stem is designed to fly out, and the triple valve stem seal design of O-ring, graphite filler and injection sealing grease meets the leakage requirements, can work reliably for a long time, does not require fastening and maintenance, and has fire prevention function.
- 04The bottom adjustment rod supports the valve core and guides out the static electricity generated by the valve core due to various reasons.
- 05The surface of the plug cone is polished to a mirror surface, and the sealing surface of the valve body is polished for lower opening and closing torque.
- 06The adjustment rod installed at the bottom of the valve cover adopts a built-in structure. After the adjustment is completed, tighten the gland to completely zero leakage.
Design Standard
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| The characteristics of lubricated plug valve |
The lubricated plug valve uses forced lubrication to form a layer of oil film between the plug valve and the plug body sealing surface, which improves the sealing performance of the plug valve, saves effort when opening and closing the valve, and prevents the sealing surface from being damaged and plays a role in protecting the sealing surface. In order to further reduce the opening and closing force resistance of the plug valve, the method of reducing the diameter of the plug valve is usually used, so the plug valve usually adopts a rectangular flow channel, which reduces the opening and closing torque of the plug valve and increases the fluid resistance of the plug valve. Surfacing STL alloy material or surface hardening technology is used to enhance the wear resistance and corrosion resistance of the sealing surface, and the service life is long. The valve core surface is hardened and has a special oil tank circuit. There are double sealing grease injection devices outside the valve body. One is to achieve emergency sealing of the valve stem by injecting grease, and the other is to inject grease into the upper cavity of the valve body. |
| Technical Parameters | |
| Size | DN15-DN1500, 1/2''-60'' |
| Pressure | PN10-PN420, Class150-Class2500 |
| Temperature | -200°C to 650°C |
| Connection Type | Flange, Thread, Socket weld, Butt weld |
| Operation Mode | Manual, Pneumatic, Electric, Hydraulic, Gear operation |
| Materials | ||
| Valve Body | Forged | A105, LF2, F5, F9, F11, F22, F304, F316, F347, F904, F51, F53, F310, N08020, Inconel625, etc |
| Cast | WCB, LCB, C5, C12, WC6, WC9, CF8, CF8M, CF8C, 4A, 5A, CN7M, C95800, CW6MC, etc | |
| Valve Stem | F6a, 17-4PH, XM-19, F304, F316, F347, F904, F51, F53, F310, Monel400, Monel500, N08020, Inconel625, Incoloy825, etc | |
| Valve Disc | A105, LF2, F5, F9, F11, F22, F304, F316, F347, F904, F51, F53, F310, N08020, Inconel625, F6a, 17-4PH, XM-19, F304, F316, F347, F904, F51, F53, F310, Monel400, Monel500，Incoloy825，WCB, LCB, C5, C12, WC6, WC9, CF8, CF8M, CF8C, 4A, 5A, CN7M, C95800, CW6MC, etc | |
| Seat Sealing | SS, BR, CU, AS, CS, AL, PTFE, NBR, FKM, AI203, etc | |
| Design Standards | |
| Valve Body | API 6D, API 608, ASME B16.34, DIN 3357, BS 5351, GOST 9833, JIS B2071, GB/T 12237, etc. |
| Flange | ANSI B16.5, EN 1092-1, JIS B2220, GB/T 9113, ASME B16.47, GOST 12821, DIN 2543-2545, etc. |
| Connection | ANSI B16.10, ASME B16.25, JIS B2212, GOST 33259, DIN 3202, etc. |
| Test Standards | API 598, ISO 5208, BS EN 12266, ASME B16.104, GOST 9544-2015, JIS B2003, DIN 3230, etc. |
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