English to Italian Tech/Engineering Mechanics / Mech Engineering Valvole

Buongiorno a tutt*!
Ho un dubbio sulla traduzione del termine "treadle" contrapposto a "pedal" (si parla di valvole).
Ecco il testo:

"TYPE "T" TREADLE (for heel-toe operation).
Provides full support for the foot of the operator. This device may be used with 2-position or 3-position valves. When used in conjunction with a spring return ("S") or a differential pilot return ("K"), actuation is provided by the operator depressing the treadle with his heel. When used with a reverse spring device ("R"), actuation is provided when operator depresses the treadle with his toe. With a detent device ("U" or "Z"), a no-spring return device ("N"), or a spring centering device ("B") actuation is provided by depressing with the heel to one offset position and by depressing with the toe to the other offset position".

"TYPE"F" PEDAL (for toe operation)
Applied to 2-position valves only and is usually used with either a spring return ("S") or differential pilot return ("K") device. The pedal lends itself to tiptoe operation. Actuation is accomplished when operator depresses pedal. When operator removes foot from pedal, pedal is returned or reset to unactuated position by return device on other end of valve".

Esiste un termine specifico per differenziare i due tipi di pedali? Grazie mille in anticipo per qualsiasi suggerimento!