Intro4u2u

API Specification 6D Twenty-second Edition – Introduction

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6.10 Handwheels and wrenches (levers)

Wrenches for valves shall either be of an integral design or consist of a head which fits on the stem and is designed to take an extended handle. The head design shall allow permanent attachment of the extended section if specified by the purchaser.
The maximum force required at the handwheel or wrench to apply the breakaway torque or thrust shall not exceed 360 N.
Wrenches shall not be longer than twice the face-to-face or end-to-end dimension of the valve.
Handwheel diameter(s) shall not exceed the face-to-face or end-to-end length of the valve or 1 000 mm, whichever is the smaller, unless otherwise agreed. Except for valve sizes DN 40 (NPS 11/2) and smaller, spokes shall not extend beyond the perimeter of the handwheel unless otherwise agreed.
When specified by the purchaser, the handwheel of the gearbox input shaft shall be provided with a torque-limiting device, such as a shear pin, to prevent damage to the drive train.

6.11 Locking devices
Valves shall be supplied with locking devices if specified by the purchaser. Locking devices for check valves shall be designed to lock the valve in the open position only.
Locking devices for other types of valve shall be designed to lock the valve in the open and/or closed position.

6.12 Position indicators
Valves fitted with manual or powered actuators shall be furnished with a visible indicator to show the open and the closed position of the obturator.
For plug and ball valves, the wrench and/or the position indicator shall be in line with the pipeline when the valve is open and transverse when the valve is closed. The design shall be such that the component(s) of the indicator and/or wrench cannot be assembled to falsely indicate the valve position.
Valves without position stops shall have provision for the verification of open and close alignment with the operator/actuator removed.