Integral Metal Seat. With our exclusive HVOF RiTech® coating process, the integral seat in ValvTechnologies’ rotary operating valves are resistant from the attack of abrasive magnetite or ferrous oxides in the steam flow.
Body Seal Ring. ValvTechnologies employs a field proven seal ring technology to ensure sealing under all operating conditions, up to 1400°F. The body seal ring is loaded at a pressure higher than 20,000 psi. In addition, valves sized 3″ and above contain a secondary Grafoil seal to further guarantee reliability
Patented Coating Process. The sealing surfaces are overlaid with tungsten or chromium carbide using our exclusive HVOF RiTech® process. These surfaces have a hardness of 68 – 72 Rc to allow long periods of operation in the most severe conditions.
The Xactrol® product group unites ValvTechnologies’ zero-leakage technology with special designs that allow rotary modulating control. From the Mark I’s design that features a characterized upstream seat to the Mark III’s precision engineered stacked disks, the Xactrol® allows the customer to combine precise flow control with tight shut-off. The Xactrol® is typically used in applications where minimum flow and relatively high differential pressures are required.
Superior failure resistance and reliability. Benefit: Enhanced process safety
Constant packing load maintained with four-stud, live-loaded packing assembly. Benefit: Increased safety, enhanced process efficiency, environmentally friendly
Control trim made from extremely hard components. Benefit: Reduced wear, increased life of the valve
Zero-leakage shutoff. Benefit: Enhanced process safety, increased efficiency
Resistance to small entrained solids. Benefit: Lower maintenance costs, increased reliability
Mark III Design
Designed for minimum/normal flow control conditions
Variety of characterized upstream seats available
Engineered to meet your control needs
For applications requiring very high-pressure drops
Includes a series of upstream pressure reducing plates
For the most difficult control applications
The Mark III is designed for high ΔP liquid applications where cavitation and flashing are a concern and for high ΔP gaseous applications where fluid is flowing at sonic velocity. Applications include: boiler feed pump re-circulation and bypass.
Mark I – single stage pressure drop
Mark II – single stage pressure drop, continuous blowdown