Further, the rubber sleeve of the valve up to 2" (50mm) have a unmarried lug on both side and it goes into the hole passage of the pinching bar where it is fixed with the lug clamping screws. Within the better sizes above 2" the sleeves have lugs on each aspects and are geared up overlapping the pinching bar. A rubber sleeve is covered under a forged iron, solid metallic – wcb, chrome steel, alluminium, split frame casting.
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