Severe Service Knife Gate Valve (SSKGV)
Today, the Severe Service Knife Gate Valve (SSKGV) leads the way with the most technologically advanced design on the market today. The SSKGV completely removes the chance for fugitive emissions, surpasses the rigorous standards for Severe Service defined by the MSS, and provides bi-directional zero leakage from full vacuum to ASME Class 1500/PN 250 pressures (3750 psig/250barg).
Created in: 2017 (Generation V of Guided Shear Gate)
Design: The SSKGV utilizes a Guided Shear Gate Design that consists of three key elements: a mechanically retained axial seat, a shearing gate tip and internal gate guides. From open to close the gate is guided the entire way removing any option to deflect when solids are encountered. When the material is struck by the shearing tip, it is cut, fractured, and pushed away downstream inside the pipeline (no discharge to atmosphere). These features enable zero leakage, zero emissions, and zero discharge where the gate meets the primary seal. A secondary seal backs up the primary seal for extra peace of mind. Transverse seals coupled with the primary seal prevent fugitive emissions.
Capabilities/Where it works: Severe Service Knife Gate Valves are designed to handle the harshest of conditions in a variety of industries. That however doesn’t mean they shouldn’t be considered for more general applications as well.
Why it Fails: Though unlikely the primary seal is subject to the erosive and possibly abrasive wear that occurs when the valve is closing against flowing media. Though, there are cases where the DSS SSKGV has cycled over 25,000 times with zero leakage.
Industrial Process Industries: