BS1 Series General Purpose Bellows Valve - Durable Design for Extended Service Life. This one-piece forged valve features hydraulically molded bellows for longevity, a non-rotating head to prevent wear, and replaceable heads for easy maintenance. With working pressures up to 250.0 bar and operating temperatures from -28℃ to 450℃, this valve offers reliable performance in a variety of applications. Choose panel or bottom mounting for added versatility.