Bud type ring (PBA) is a compression seal made of abrasion-resistant polyurethane, which can also be used for piston seals due to its symmetrical design. Due to its symmetrical design, it can also be used as a piston seal. o-rings provide preloading of the lips, which ensures a seal even under low pressure or vacuum. As the system pressure rises, the compression of the lip is increased by the compression of the sealing structure, resulting in a reliable seal.
