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Clarkson KS3 Severe Service Knife Gate Valve
Clarkson KS3 Severe Service Knife Gate Valve
Emerson’s Clarkson KS3 is a true bi-directional, zero-leakage ASME Class 300 knife gate valve designed for the rigors of severe service applications.
The KS3 is engineered to extend valve life and service intervals, to deliver a lower total cost of ownership.
Clarkson KS3 Severe Service Knife Gate Valve


DN 80 – 400 (NPS 3 - 16)
Operating Temperature
Up to 205°C (400°F)
Pressure Class
ASME Class 300
Mining and Minerals, Oil Sands, Pulp and Paper, Coal Preparation, Power, Steel
CRN (pending)
Design Standard
MSS SP-135, ASME B31.3
Face to Face
MSS SP-135 Short
End Connections
ASME 300, AS 2129 Table H, PN 50


  • True bi-directional flow and zero leakage shut-off; can be installed in either direction
  • Heavy cross section precision-molded elastomer seat provides more surface area for superior isolation
  • Field-adjustable, patented gate edge seal system prevents leakage through top of valve
  • Enclosed body design prevents any leakage to the outside environment
  • Full round port and seat design offers low pressure drop across valve and longer service life in abrasive applications
  • Standard inlet and outlet replaceable, rotatable Ni-Resist wear rings extend service life
  • Modular frame design allows for installation of any standard accessory without modification