• Overview
  • Specifications

Overview

Spurs

Cameron DYNATORQUE spurs are heavy duty, utilizing iron and steel components in their construction. DYNATORQUE spurs have two distinct applications. First, as an add-on, including close-coupled spur gear assists (torque multipliers) for the DYNATORQUE worm gear and bevel gear operator product lines. The added ratio provided by these products allows for reductions in handwheel sizing and/or handwheel rim pull effort. Secondly, they provide a standalone, low- ratio, non-self locking torque multiplier for small non-rising stem gate and globe valves and other non-self locking applications that require torque multiplication, such as small electric motor operators.

Miters

Our DYNATORQUE miters also are heavy duty, utilizing iron and steel components in their construction as well. Like the spurs above, DYNATORQUE miters have been designed for two distinct purposes. Generally, this product is used as an add-on, including a close-coupled gearbox that changes handwheel input shaft direction on the DYNATORQUE worm gear and bevel gear product lines. Additionally, as a standalone product, a miter may be used to change shaft direction (90 degrees) on any rotating member with compatible torque values and interface dimensions.

DYNATORQUE spurs and miters are suited for applications where maximum valve torque ratings have been accurately calculated. All units have been designed to withstand loads in excess of their rated torques. Gearboxes in this category are completely enclosed, weather-resistant, and permanently lubricated. Units are suitable for use in all handwheel and chainwheel applications. 

Model numbers that end in "A" are standalone models that are not made to close couple to existing products. These models also have input (handwheel shaft) and output shaft connections. Models that do not end in "A" are designed to close couple to DYNATORQUE quarter-turn worm gear and bevel gear products. These models have input (handwheel) shaft connections and use the input shaft from the primary operator for their output shaft connections. Models that do not end in "A" are offered as component parts that are assembled to primary operators.

Materials

Unit housings and covers are iron, gears are carbon steel and heat-treated carbon steel, shafts are carbon steel with yellow zinc coating, shaft seals are Buna-N rubber, housing-to cover seals are styrene butadiene, bushings are oil-impregnated copper nickel steel alloy, and bearings are tapered roller and needle type.

Specifications

Miter Gears

Model  Unit
Weight
lb
Maximum
Output 
Torque
lb-in
Gear
Ratio
Turns for
90 Degrees
Standard
Output
Shaft
Standard Mounting
Pattern
(Quantity and Size)
Standard Mounting 
Pattern
(Bolt Circle)
Mechanical 
Advantage
MT1 25 3000 1:1 1 N/A (4).406 1.250 x 2.250* 0.9
MT1A  26 3000 1:1  1.000  (4).406  1.250 x 2.250*
0.9


Spur Gears

Model  Unit
Weight
lb

Maximum
Output 
Torque
lb-in
Gear
Ratio
Turns for
90 Degrees
Standard
Output
Shaft
Standard Mounting 
Pattern
(Quantity and Size)
Standard Mounting 
Pattern
(Bolt Circle)
Mechanical 
Advantage
4:1  34 10,000  4:1  4 N/A  (4).406  1.250 x 2.250* 3.2
4:1A 36 10,000 4:1
4 1.000  (4)1/2-13 2.00 x 2.750
3.2
6:1 37 12,000 6:1  N/A (4).406  1.250 x 2.250*
4.8 
6:1A
39 12,000 6:1  N/A
(4).406  1.250 x 2.250*
4.8

*Bolt patterns are offset to match standard spur and miter attachment patterns on faced operators. See product drawings.

Notes:

1. Formulas listed below will assist you in determining handwheel sizes and rim pull requirements based on your application. 

To Find: Handwheel diameter for a given output torque at a given rim effort, divide the output torque by the mechanical advantage and multiply the result by two. Then divide this result by the handwheel rim effort.

To Find: Rim effort for a given output torque with a given handwheel diameter, divide the output torque by the mechanical advantage and multiply the result by two. Then divide this result by the handwheel diameter.

2. Handwheels are not included as part of the operator part list or price.