• Overview
  • Specifications

Overview

Cameron DYNATORQUE valve accessories include spurs and miters that are suited for applications in which 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 stand-alone 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 Cameron 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.

Spurs

Heavy-duty Cameron spurs utilize iron and steel components in their construction. The spurs have two distinct applications. First, as an add-on, including close-coupled spur gear assists (torque multipliers) for our worm gear and bevel-gear operator product lines. The added ratio provided by these products enables reduced handwheel sizing, handwheel rim pull effort, or both. Secondly, they provide a stand-alone, low-ratio, nonself-locking torque multiplier for small nonrising stem gate and globe valves and other nonself-locking applications that require torque multiplication, such as small electric motor operators.

Miters

Our miters also are constructed with iron and steel components. Like the spurs, Cameron 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 our worm gear and bevel gear product lines. Additionally, as a stand-alone product, a miter may be used to change shaft direction (90°) on any rotating member with compatible torque values and interface dimensions.

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 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,
lbm
Maximum Output
Torque, in.lbf
Gear
Ratio
Turns for
90°
Standard Output
Shaft
Standard Mounting
Pattern Quantity
and Size, in
Standard
Mounting
Pattern
(Bolt Circle)
Mechanical Advantage
MT1 25 3,000 1:1 1 N/A Four 0.406 1.250 x 2.250 0.9
MT1A  26 3,000 1:1  1.000  Four 0.406  1.250 x 2.250
0.9


Spur gears

Model  Unit Weight,
lbm

Maximum Output Torque,
in.lbf
Gear
Ratio
Turns for
90°
Standard Output
Shaft
Standard Mounting
Pattern Quantity
and Size, in
Standard
Mounting
Pattern
(Bolt Circle)
Mechanical Advantage
4:1  34 10,000  4:1  4 N/A  Four 0.406  1.250 x 2.250 3.2
4:1A 36 10,000 4:1
4 1.000  Four 1/2–13 2.00 x 2.750
3.2
6:1 37 12,000 6:1  N/A Four 0.406  1.250 x 2.250
4.8 
6:1A
39 12,000 6:1  N/A
Four 0.406 1.250 x 2.250
4.8

Bolt patterns are offset to match standard spur and miter attachment patterns on faced operators.

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 2. 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 2. Then divide this result by the handwheel diameter.

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