Pot bellows for piston

摘要

Additional piston or disc (3) is provided at a distance from the end of a bellows (1), with a spacer ring (4), having a hole for a plunger (2). When the plunger is operated, the disc enters the cavity formed in the bellows, preventing the formation of kinks. Preferably, the spacer ring is lengthened so that, when the plunger is operated, the disc enters the cavity just before kinks are formed, so that only the necessary portion is supported.