General Description: Leakage from the valve packing gland is often a problem for environment protection & sometime it is quite dangerous if such leakage is from a hazardous fluid or gas. KOS bellows sealed valves are designed with a bellows cartridge which welded to the valve bonnet and stem, when the stem up & down movement makes the bellows expands & compress. Therefore there is no sliding or rotating seals through which process fluid can leak.

Design and Manufacture:       EN 13709
Face to Face Dimension:       EN 558-1
Flange Connection Dimension:  EN 1092-1
BW Connection Dimension:     EN 12627
Test and Inspection:           EN 12266

Size:             DN15 ~ DN400

Rating:           PN 16 ~ 110
Body Materials:   Carbon Steel, Stainless Steel, Cr-Mo Alloy Steel, Duplex Steel

Bellow Materials:  SS304, SS316L, SS321, Inconel, Hastelloy C276
Trim:             Per API 600
Operation:        Handwheel, Gear, Motorized, Pneumatic

Zero stem emission

Flexible graphite stem packing secondary seal
Welded seat ring or integral body seating surface
8,000 cycles bellow without failure

Non-rising stem

Refinery
Petrochemical
Solar energy power plant

Hot oil, steam supply, thermal industry
General Industry