Features & Benefits
• Tightening of thrust pad tolerance
Due to the innovative design of our square drive Hobbs Valve no longer requires a temperature expansion gap to allow for shaft movement. This eliminates the possibility of collision between seat and seal during the installation of an actuator, transport of the valve or heat expansion during high or low intensity applications on the Hobbs Valve triple Offset Butterfly Valve.
• Free floating bearings
Valve manufacturers experience bore miss-alignment whilst machining the bearing bore causing galling between components which can increase the torque requirement. The use of free floating bearings eliminate unnecessary friction by taking up any tolerance due to bore miss-alignment maintaining parallel bearing load between shaft and internal bearing surface. This ensures the torque required to seal the valve is kept to a minimum at all times.
• Circular conical sealing geometry
Historically all triple offset butterfly valve manufacturers have an elliptical sealing geometry and valvebore due to the necessity to manufacture the third offset geometry into the sealing components. Hobbs Valve is able to eliminate the need for this through the use of up to date modern machines increasing the Cv value of the valve and reducing the machining cycle times during its manufacture.
• Bearing protectors as standard
Bearing protectors are normally an added cost when purchasing a valve as it is deemed in many cases to only be necessary in dirty service. Hobbs believe that this component also has an effect on maintaining reduced torque requirements during its life cycle by reducing the potential of particle ingress between the bearing, bearing bore and shaft.
• Removal of Keyways or Pins
Commonly disks are mechanically operated through the use of pins or keyways along the drive chain. This technique has the ability to weaken the shaft, increase torques and introduce potential of shearing during high velocity applications. Through the introduction of a square shaft along the full length of the drive chain Hobbs has eliminated these problematic areas whilst also reducing the torque requirement to operate the valve.
• Integral anti blow out device
API 609 requires the prevention of the shaft from exploding out of the valve whilst under pressure. In an attempt to guarantee this from occurring Hobbs has four anti blow out devices with the primary anti blowout device being integrally machined into the gland plate also eliminating the possibility of human error.
• Square actuation drive allowing for multiple orientation
This allows for the operator whether manual or automated to be positioned in any 90 degree position in case of obstacles or preferred orientation. With the lack of pins or keyways this is changeable on site by the operator if necessary.
• Patented design
Hobbs Valve introduced innovations to the triple offset butterfly valve that previously had not been changed for over 15 years. With the introduction of a square shaft along the drive chain and a solid seat Hobbs eliminated the need for a gasket due to blind hole bolting. The patented design allows for two replaceable sealing components with only one possible gasket leak path.
