Tube Turns Yoke Style Closures


Yoke Style ClosureOur Double Bolt Yoke style closure is compact in size and functional in design. A typical unit consists of a forged hub, a hinged blanking head, split-yoke clamps, operating bolts, and a self-energizing O-ring gasket. Materials of construction are in accord with ASME specifications, of course, and manufacture complies with applicable rules of the ASME code for Pressure Piping and with the ASME Boiler and Pressure Vessel Code.

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Faster, Easier Operation

Operation is smooth and direct, and even the largest unit can be opened or closed in a matter of minutes. Turning of the actuating bolts - accomplished by one man using only standard hand tools - spreads the yoke halves until they are fully separated, allowing the head to be swung open on its hinge. There is no need to tug or hammer at bulky flanges or heavy metal doors or to struggle with bulky lugs and threads.

Contact surfaces of the clamping yokes, head and hub are tapered at less than the friction angle of dry carbon steel. When the head is closed and the yoke bolts are tightened, the head and hub are wedged together, compressing the O-ring and affecting a leak proof seal. After the pipeline or vessel has been pressurized, the end load on the closure head intensifies frictional resistance at the tapered surfaces, thereby developing an inherent holding action that tends to overcome the relatively small component of force seeking to separate the holding elements. This design pre-supposes non-lubricated contact surfaces.

ASME Code Stamped Closures

Code stamping of Tube Turns Hinged Closures is available on request at a nominal extra cost. This includes (1) the furnishing of a Partial Data Sheet verifying shop inspection of the unit by a commissioned inspector of the National Boiler and Pressure Vessel Inspectors, and (2) the affixing of the ASME stamp on the closure.

Manufacturer's Statement of Code Compliance

In the event that shop inspection and stamping in accordance with Section VIII of the ASME Boiler and Pressure Vessel Code is not required, Tube Turns can furnish a Manufacturer's Statement of Code Compliance. This document affirms that the Hinged Closure is manufactured in accordance with the applicable requirements of the code.


Chain & Sprocket

The Chain and Sprocket Drive option is by far the most economical opening assist device we offer. This is a manually operated aid which assists in the opening and closing of the yoke bolts. These units not only make the process faster, they also prevent the uneven movement of the yokes which may cause binding. On larger closures, ratio reduction is available to further ease the force required to turn the unit. Hand wheels can also be furnished which provides faster operation and eliminates the need for additional tools.

The basic pattern of the Tube Turns' Chain and Sprocket Drive follows the basic principle of the fimiliar bicycle chain and sprocket arrangement. Same size sprockets are attached to longer than standard yoke bolts. Positioned around the sprokets is a linked belt of chain. For safety precautions, a chain and sprocket gaurd is furnished. A lever or crank is fitted to one of the sprockets which when turned rotates both yoke bolts simultaneously. This device can be modified by changing the ratio of the sprockets to increase speed and ease of opening the yoke bolts.


Tube Turns offers Double-Bolt Yoke Style Closures that can be completely automated and operate by the touch of a button. This is a significant advantage in that it can be driven by a multiplicity of mechanical, electrical, hydraulic and pneumatic devices to provide quick opening and closing for numerous applications.
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In addition to this flexibility, our Automated Yoke Style Closures have other advantages:


Automation provides a tight seal, which prevents leakage and exposure of the operators to any medium that may be potentially hazardous to their health.

Improved Employee Morale

With the environmental concerns in the industry today, Automated Closures enable the operator to be stationed away from the reactor thus eliminating their exposure to hazardous mediums. As a result, the operator's health concerns are reduced significantly.

Economic Considerations

Depending on the size, the opening and closing cycle can take less than one minute. One man can operate the closure with the push of a button.


Since operation is simple, direct and positive, Automated Closures require little or no maintenance other than replacement of the O-ring and periodic inspection of yoke bolts and nuts for wear. The human element is virtually eliminated in that the automation mechanism of the closure performs all the work.

Tube Turns Automated Closures have flexibility of design and can be developed and manufactured to meet your needs. Our Automated Closures are located in industries throughout the world. Applications for Tube Turns Automated Closures include Pipeline Launchers and Receivers and operations with batch processes such as pulp and paper mills, food process, chemical plants and petrochemical plants.

  • Chain & Sprocket Automated Closures
  • Electric Automated Closures
  • Hydraulic Automated Closures
  • Pneumatic Automated Closures
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