Fasteners

When discussing mounting kit designs, most of the concerns and conversations revolve around the strength and materials of the bracket and coupling. These components are indeed critical; however, when is the last time you discussed fasteners in detail? These often-overlooked components are trusted to unfailingly connect the bracket between the valve and actuator. VanAire provides correctly graded fasteners and calculates the capability of the fasteners and their resistance to applied loads. These connection points are defined as friction-type shear joints. This bolted joint relies on the frictional force between joint members generated by the fastener clamping force to resist shear forces (e.g., actuator torque and weight). Check out the fasteners in other mounting kits in your inventory. Check out the head markings, if any, and compare them to our VanAire Fastener Reference Guide. If you are using fasteners that are not marked, chances are you are unable to achieve enough clamping force to prevent the bolting from entering a shear condition.

ISO 12490, 2011 and, API 6DX, 2020 Industry Standards provide direction on how to properly connect a mounting bracket between the valve and actuator.

  • Bolting in mounting kits shall not be subjected to shear forces, unless otherwise agreed.
  • Bolting of mechanically loaded parts and mounting kit components shall be designed to accommodate the direct loading applied by the actuator design torque/thrust and, if applicable, purchaser-defined external loads (e.g., seismic, blast, structural, snow/ice).
  • The threaded portion of bolting shall not be subjected to direct shear due to transverse loading.
  • For a valve without an anti-rotation feature (e.g., dowel pin or fitted bolt), the design shall include a calculation of bolt tension to generate a clamping force (e.g., between the valve and actuator, between the valve and mounting kit, and between the actuator and mounting kit) that is sufficient to prevent slippage of bolted connections.
Download the VanAire Fastener Reference Guide

Inspect it.

Check out the fasteners in your inventory, in other mounting kits. Inspect the head markings, if any, and compare them to our VanAire Fastener Reference Guide. If you find any that fall into the ‘low yield’ strength category, we strongly suggest that you consider not using them.

A mounting kit is only as strong as its weakest link. That could be the bracket thickness, coupling material, the welding or even the fastener. VanAire engineers and manufactures every aspect of the mounting kit to known industry standards.

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We get it. Lead times are short, and budgets are shrinking. Get started on your upcoming job with the VanAire team and we’ll start the planning process, together.

We get it. Lead times are short, and budgets are shrinking. Get started on your upcoming job with the VanAire team and we’ll start the planning process, together.

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Engineered Valve Automation Hardware

Setting the Benchmark.

Check out our recent spotlight in Valve World Americas featuring “The Anatomy of a Locking Kit” outlining how every link in the chain is critical.

Check out our recent spotlight in Valve World Americas featuring “The Anatomy of a Locking Kit” outlining how every link in the chain is critical.

Read the Article