Factors Affecting the Price of Bellows Seal Globe Valve DN50

Currently, the price of a bellows seal globe valve DN50 generally ranges from RMB 1,800 to RMB 6,800. The specific price is influenced by the following factors:

Valve Body Material: Cast steel (WCB) costs approximately RMB 1,800-3,200; stainless steel (304/316) costs RMB 2,800-5,200; chrome-molybdenum steel (WC6/WC9) for high temperatures costs RMB 3,800-6,800.

Bellows Material: Stainless steel 304 bellows costs RMB 1,800-3,500; stainless steel 316L bellows costs RMB 2,800-4,800; Inconel high-temperature alloy bellows costs RMB 4,500-6,800.

Seal Type: Bellows + packing dual seal is standard configuration; PTFE soft seal is suitable for clean media; STL hard seal offers high temperature resistance and erosion resistance.The main stop valve product names of China Stop Valve Network include:ANSI Flange Straight-through Bellows Globe Valve,Forged Steel Straight-through Globe Valve,Flange Straight-through Low Temperature Globe Valve,High Temperature and Pressure Power Station Electric Globe Valve,Oxygen-specific Globe Valve,Vacuum Isolated Straight-through Globe Valve,Y-type Jacket Insulation Globe Valve,GB Bellows Globe Valve.

Actuation Method: Manual (handwheel/bevel gear) is the basic configuration; pneumatic or electric actuator configurations can increase the total price by 50%-80%.

Principle of Zero Leakage

The core of the bellows seal globe valve lies in the bellows assembly. The lower end of the bellows is welded to the valve stem, and the upper end is connected to the bonnet, forming a completely sealed metal barrier. When the valve stem moves up and down, the bellows expands and contracts accordingly, and the medium is completely isolated outside the bellows, unable to escape along the valve stem. Even if the bellows fails unexpectedly, the upper packing seal still serves as a second line of defense, ensuring absolute zero leakage.

Purchasing Suggestions

It is recommended that users request bellows fatigue test reports from suppliers (typically requiring ≥10,000 cycles without leakage). Confirm the compatibility of the bellows material with the medium, and provide medium temperature, pressure, and opening/closing frequency parameters. When purchasing, confirm that the valve complies with DIN EN 13709 or GB/T 26481 standards. It is advisable to request quotes from at least three professional bellows valve manufacturers for comparison, and give priority to products with integrated bellows and valve stem welding technology.

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