Mechanical seal R-B151-bellows type, single, with central spring, independent of the direction of rotation of the shaft. For inch shafts (from 0.5" to 3.00") with an American standard working length. Application: centrifugal pumps, vacuum pumps, water supply systems, wastewater treatment, moderately abrasive liquids, chemistry, food industry, etc. Type: Vulcan 1511/1522, AESSEAL BP04 / BP05, Flowserve 151 /152. Temperature: -40 ° ~200° Pressure: ≤1.20 MPa Speed: ≤15 m / sec Materials: - rotating ring: Carbon / SIC / TC. - stationary ring: Ceramic / SIC / TC. - bellows: NBR / EPDM / VITON. - spring: SS304 / SS316. - metal parts: SS304 / SS316.