BOACHEM-ZXAB

– Leak-free stem seal

– Primary sealing to atmosphere by multi-walled metal bellows welded to the stem
– Secondary sealing to atmosphere by multiple packing rings made of graphite
– Double graphite gaskets between body and bonnet (single-piece upper valve section), or between bonnet and yoke (two-piece upper valve section)

– Reliable sealing of body-bonnet joint

– Gaskets are fitted above and below the end fitting of the bellows assembly.
– The lower gasket is confined by the body shoulder and the end fitting of the bellows, resulting in a longer service life. No direct contact with fluid handled.
– The upper gasket serves as a back-up seal preventing fluid from leaking into the atmosphere in the event of a bellows failure.

– Longer service life of bellows

– Multi-walled bellows designed to withstand 1.5 times the nominal pressure
– Positive anti-rotation device prevents bellows from twisting.
– Travel stop prevents excessive compression of bellows.
– On large valve sizes the bellows is positioned well outside the flow path and thus not exposed to abrupt changes in fluid pressure.
– Guided valve disc (on large valve sizes) prevents bellows vibrations.

– Ease of service without additional costs

– No cost for daily or frequent maintenance work thanks to reliable bellows seal
– If required, a leakage detection hole can be provided in the gland packing area.

– Operating reliability

– Travel stop prevents valve damage caused by excessive actuating forces.
– Position indicator for identification of valve disc position

– Suitable for various installation positions

– Guided disc design (of large valve sizes) allows valve installation in any position (also with horizontal stem).

– Suitable for high differential pressures

– Version with pilot plug (on large valve sizes) for valve duties up to the nominal pressure; no limitations for high differential pressures.

Globe valve

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BOACHEM ZXAB/ZYAB, Edel ZYAB, Stainless Steel Globe Valve (8115.022_EN)