XANIK PRESSURE SEAL VALVES
Pressure Seal Valve Designs
Xanik pressure seal valves come in gate, globe, swing check, stop check, lift check, as well as tilting disc check designs. These valves perform well in high-pressure and high-temperature applications. So, several industries rely on them for main steam, reheat, and feed water systems. They also support catalytic reforming and other demanding processes. In addition, power plants, SAGD operations, and refineries use these valves for efficient and reliable flow control. Their relevance does not stop there, they are also essential in petrochemical and other process industries that require durable, high-performance valves.
Design Features of Xanik Pressure Seal Valves
- Detachable yoke without affecting the body bonnet joint.
- Integral “T” head stem construction for packing and wedge auto aligning.
- Integral “T” head stem construction for packing and wedge auto aligning.
- Integral “T” head stem construction for packing and wedge auto aligning.
- Self-Aligning two pieces packing gland.
- Flexible graphite packing with anti-extrusion rings for optimum seal ability and life.
- Live-loaded packing – optional
- Seal gasket load ring withstands upward thrust of bonnet load; backing ring distributes pressure uniformly to load ring; metallic silver-plated seal gasket provides tight closure.
- Integral backseat, Stellite hard-faced.
- Flexible Wedge, fully guided, wedge and seats are hard faced with Stellite 6 or Tribaloy® T-900.
Flexible Wedge
- Fully guided, wedge and seats are hard-faced with Stellite No. 6 or Tribaloy® T-900 for longer life.
- The wedge gate valve is one of the first choices of isolating valve, with good sealing capabilities and low fluid friction losses.
- The wedge is effectively clamped between two full-bore seats and seals on both sides.
Parallel Slide Disc
- Auto aligned, fully guided, disc and seats are hard-faced with Stellite No. 6 or Tribaloy® T-900 for longer life.
- Inner springs compensate for thermal deformations due to high temperature.
- The parallel slide disc is suitable for demanding applications, especially where significant temperature changes occur and where valve body distortion may be a problem.
Pressure Equalizing in Xanik Pressure Seal Valves
In conventional double-seated parallel gate valves, trapped liquid can expand due to heat. Moreover, this thermal expansion increases pressure inside the closed valve chamber. The rising pressure forces the upstream and downstream discs into tighter contact with their seats. As a result, excessive stress builds up in the valve chamber. This added stress can make turning the handwheel difficult when raising the disc. If pressure rises too quickly, it may lead to leaks or body deformation. To prevent these issues, these valves require a pressure-equalizing connection. This connection balances pressure between the valve chamber and upstream piping, thus ensuring safe operation.
