General Description: Leakage from the valve packing gland is often a problem for environment protection and 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:       BS 1873
Face to Face Dimension:       ASME B16.10
Flange Connection Dimension:  ASME B16.5
BW Connection Dimension:     ASME B16.25
Test and Inspection:           API 598

Size:             NPS 2"~16" (DN50 ~ DN400)

Rating:           ANSI 150lb ~ 600lb (PN20 ~ PN100)
Body Materials:    Carbon Steel, Stainless Steel, Cr-Mo Alloy Steel, Duplex Steel

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

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