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Power of Comparison

Vortex HDPV2 Gate vs. Alternatives

• Many alternative slide gates and butterfly valves rely on seals which are directly exposed to the material flow stream. These seals rapidly erode or tear away in service. This deficiency promotes leakage of materials and dusts past the gate and to atmosphere, in addition to actuation issues and several other maintenance concerns. The Vortex® HDPV2 Gate™ addresses these issues by incorporating a durable, silicone (durometer 70) O-ring seal, which provides greater wear resistance and longer service life than alternative sealing materials. To hinder materials from migrating into the gate body, the HDPV2 Gate also features a bonnet seal cartridge, which houses a PTFE-treated packing gland. PTFE-treated packing gland also provides greater wear resistance and longer service life than alternative sealing materials. Within the bonnet seal cartridge, the packing gland expands to create a dust-tight seal around the vertical perimeter of the blade. The bonnet seal cartridge shields the packing gland from the material flow stream, to protect it from abrasion. This design maintains the gate's positive seal with infrequent maintenance intervention. Once the packing gland has experienced significant frictional wear, it can be removed and replaced to restore the gate’s dust-tight seal. This maintenance process can be performed while the gate remains in-line.

• A butterfly valve's rotating disc is directly exposed to the material flow steam, which creates wear to the disc itself. The exposed disc also disrupts convey line pressures and obstructs material flow as they pass through the valve, which can cause line plugs and other maintenance concerns. To resolve these issues, when the HDPV2 Gate is open, its sliding blade is recessed to create an unobstructed opening that maintains convey line pressure and allows unrestricted material movement.

• The HDPV2 Gate is specifically designed to mechanically clear materials away from the sealing surfaces with each actuation. The HDPV2 Gate’s packing gland is designed to mechanically self-clean the blade with each opening stroke. This prevents the blade from carrying materials back into the gate body, which could otherwise cause actuation issues and other maintenance concerns. At the closing end of the gate, the HDPV2 Gate can be designed with a partial Special Service Inlet to create a slight void between the leading edge of the blade, the material flow stream, and the O-ring seal. As the leading edge of the blade nears the O-ring seal, a Special Service Inlet ensuresany residual materials remaining at the blade's leading edge have an opportunity to fall away into the process line, prior to the blade contacting the O-ring seal. By protecting the O-ring seal frommaterial contact, it reduces seal wear and maintains the gate's positive seal with infrequent maintenance intervention.

• Many alternative slide gates pack materials into an end seal, preventing positive closure. This promotes material leakage through the valve, can cause blade damage, and can cause other actuation issues. Upon gate closure, the HDPV2 Gate’s sliding blade "rises" upward into a seat,rather than a true end seal, so that materials remaining at the leading edge of the blade can fall away into the process line below, rather than packing into an end seal. The rising blade design also lifts the blade against the O-ring seal for a better seal of materials and dusts in high pressure applications.

• When the gate is closed, if materials and dusts begin to leak past the blade, it indicates the O-ring seal has partially worn and the compression load is lessened, causing the blade to no longer beforced against the O-ring seal as it should be. With this maintenance indication, the HDPV2 Gate's blade is externally adjustable to restore the gate's dust-tight seal. Using simple tools, the nut beneath the lower bonnet cover can be tightened. This “lifts” the blade to restore its compression load against the O-ring seal. This maintenance process can be performed while the gate remains in-line, and can be repeated several times before the O-ring seal must be replaced.