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LN81W Series Bellows Seal Control Valve

The LN81W/82 series bellows-sealed single-seat control valves are enhanced versions of the standard LN81/82 series non-pressure-balanced control valves, incorporating an additional bellows sealing mechanism. These valves feature a pressure-resistant, flexible stainless steel bellows assembly integrated within the bonnet and connected to the valve stem, forming a dual sealing system with the packing to completely eliminate potential external leakage of process media.
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  • LN81W

Designed for modulating (throttling) services with low pressure differentials, specifically handling:

  • Toxic media (e.g., hydrogen sulfide, phosgene)

  • Flammable/explosive fluids (e.g., LNG, benzene)

  • Highly volatile compounds (e.g., chlorine, ammonia)

  • Precious/rare metal process streams (e.g., gold cyanide solutions, platinum catalysts)


Nominal Diameter: DN15 ~ DN300
Nominal Pressure: PN16/25/40/63/100; CL150(PN20)/300(PN50)/600(PN110)
Operating Temperature: -45℃ ~ 350℃
Flow Characteristics: Equal Percentage, Linear, Quick Opening
Turndown Ratio: 50:1
Leakage Class: ANSI B16.104: IV, V, VI
Body Material: WCB/WCC/LCB/LCC; WC6/WC9; CF8/CF8M; 4A/5A, etc.
Trim Material: 630/316/316+ST/316 Nitriding/316+Ni60/316+WC, etc.
Packing Material: PTFE + Graphite V-Ring Packing, Flexible Graphite Ring Packing, Graphite + PTFE Braided Packing, etc.

1. Control of highly toxic/hazardous chemicals

Chlorine production (processing of liquid chlorine, chlorgase)

Production of pesticides/pharmaceutical intermediate products (phosgen, cyanides and other highly toxic media)

Semiconductor industry (special gases: high -sized ammonia, silania, etc.)

Purpose: accurate control of the consumption or pressure of hazardous chemicals to prevent leaks.


2. Flammable and explosive gases/liquids

Petrochemistry (benzene, ethylene, liquefied oil gas)

LNG terminals (cryogenic methane, ethane)

Hydrogen production and transportation systems

Purpose: regulation of pressure in pipelines or supply to reactors for flammable media.


3. High -sized and sterile processes

Biopharmaceuticals (production lines of vaccines, sterile drugs)

Food industry (high water water, enzymatic solutions)

Electronic classes of chemicals (ultra -puffy acids, solvents)

Appointment: maintaining the purity of the environment and preventing external pollution.


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