All CLAMPSEAL® valve stems have single pitch right hand threads with clockwise rotation of the handle to close. Valves used for "on-off" service should be fully open or fully closed.

 The CLAMPSEAL® valve has a backseat feature which, in the fully open position, isolates the packing from line pressure thereby increasing packing life. This is pressure actuated and requires only a light torque to effect a seal. See Table 2 for torque values.

 Always check packing gland tightness before taking off backseat to prevent leakage.