Model 224C’s limber bellows are fastened to a centerplate within the BUA. Dual-bellows models’ supple bellows are stiffly affixed by a dual valve stem running through the centerplate.
A seal with the valves is produced by the valve seats, located in the centerplate passage, as a drive arm rotated on the end of a sealed torque tube comes into contact with the valve stem in the centerplate. A noncorrosive, pure liquid with a low freezing point fills the bellows and resistance against enforced pressures is generated by a range spring assembly.
Pressure is imposed on both sides of the bellows during use. When there is a pressure change, the bellows move until the force is balanced out by the spring effect (range springs). Proportional to the DP, the linear movement of the bellows is conducted through the torque tube as a rotary motion.
If the bellows within dual-bellows units experience a DP above the unit’s DP rating, a valve shuts and the fill liquid is thus contained within the bellows. This helps avoid rupture and supports the bellows, delivering total protection in both directions due to the fact that opposing valves are enacted.
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