Valve Weight and Lifting Provisions for Field Installation

Large valves require mechanical lifting for safe installation. Understanding valve weight, center of gravity, and proper lifting provisions prevents injuries and equipment damage during installation and maintenance.

Weight Data and Documentation

Valve weight should be confirmed from manufacturer certified weight reports before planning a lift. Published catalog weights may differ significantly from actual weight including actuator and accessories.

• Bare valve weight: Body and bonnet assembly without actuator or accessories

• Assembled weight: Includes actuator, positioner, limit switches, and mounting hardware

• Packing weight: For large bore valves that arrive with packing shipped separately

• Center of gravity: Must be provided for valves above 500 kg; affects rigging selection

Integral Lifting Provisions

Valves above approximately 250 kg should have integral lifting eyes or lugs. These must be rated for the full assembled valve weight and marked with the safe working load (SWL).

• Lifting eyes: Threaded or welded; positioned at center of gravity where possible

• Trunnion lifting: Large pipeline valves have integral trunnion brackets for spread bar lifting

• SWL marking: Required on any integral lifting device; must match or exceed valve weight

• Inspection: Check lifting hardware for cracks and thread engagement before each lift

Rigging and Crane Requirements

Match the rigging to the lift plan. Slings, shackles, and spreader bars must all be rated for the lift weight with appropriate safety factors. Crane capacity at the required radius must be confirmed.

• Sling angle: Sling capacity reduces significantly as angle from vertical increases; use spreader bar to maintain vertical slings

• Shackle size: Select based on sling load including safety factor

• Tag lines: Prevent valve rotation during lift; essential for large valves

• No-lift zones: Actuators and accessories are not lifting points unless specifically designed for it

Valve Orientation During Installation

Some valve types require specific orientation for correct operation. Installing a valve upside-down or with the actuator in a restricted position causes operational problems and maintenance difficulties.

• Gate and globe valves: Stem preferably vertical (upright) or horizontal; avoid stem-down

• Ball valves: Any orientation acceptable; actuator position determines handwheel/access clearance

• Check valves: Must be installed per flow arrow; horizontal or vertical-up for swing check

• Actuator orientation: Verify stem extension and travel direction before final bolting