M Series Direct-Mount Impact (Hammer Blow) Actuator

Under certain conditions, manually operated valves can be difficult to open and close. The valve may stick, freeze, or be used so rarely that its internal parts become fused. In addition, large valves are often difficult to operate when using a standard chain wheel. In answer to these problems, Roto Hammer® offers the M Series Hammer Blow Impact Actuator. The Hammer Blow mimics the motion of a hammer striking an anvil and delivers a quick, measured blow that will free up a sticky valve without damaging its internal or external parts.

  • Ideal for overhead valves that tend to stick or are otherwise difficult to operate
  • Available in chain model (for operation above ground level) or hand wheel model (for ground level operation)
  • Either style (chain or hand model) may be ordered for Clamp-On or Direct-Mount installation
  • Direct-mount models are furnished with an adapter plate that replaces the existing hand wheel. This plate can be supplied blank or machined to fit the valve. If fitted, dimensional information is required.

When ordering, provide diameter of existing hand wheel, dimensional information (for direct mount option only) and length of chain required.

Model No. For Use With Valve Hand Wheel Diameter Weight Chain Size Additional Chain Needed for Loop Chain Weight Per m. RCK Safety Cable Kit
M9 CMAD-DI 178 mm – 248 mm
(7”- 9 ¾”)
13.15 kg
(29 lbs)
1/0 2 ft.
(610 mm)
0.253 kg
(0.56 lbs)
RCK 3/16
M12 CMAD-DI 254 mm – 324 mm
(10” – 12 ¾”)
25.40 kg
(56 lbs)
1/0 3 ft.
(914 mm)
0.253 kg
(0.56 lbs)
RCK 3/16
M15 CMAD-DI 330 mm – 425 mm
(13” – 16 ¾”)
35.38 kg
(78 lbs)
4/0 4 ft.
(1219 mm)
0.461 kg
(1.02 lbs)
RCK 1/4
M18 CMAD-DI 432 mm – 495 mm
(17” – 19 ½”)
55.79 kg
(123 lbs)
4/0 4 ft.
(1219 mm)
0.461 kg
(1.02 lbs)
RCK 1/4
M24 CMAD-DI 508 mm – 711 mm
(20” – 28” )
76.20 kg
(168 lbs)
5/0 6 ft.
(1829 mm)
0.521 kg
(1.15 lbs)
RCK 5/16
M30 CMAD-DI 762 mm or larger
(23” or larger)
97.52 kg
(215 lbs)
5/0 8 ft.
(2438 mm)
0.521 kg
(1.15 lbs)
RCK 5/16

M Series Direct Mount (M9, M12, M15, M18, M24, M30) Installation Instructions PDF – View | Download
M Series Direct Mount (M9, M12, M15, M18, M24, M30) Technical Drawings PDF – View | Download
E & M Series Direct Mount Chain Wheels, Hand Wheels & Extensions Replacement Data Sheet PDF – View | Download

CAUTION:

Chain wheel MUST be installed properly for safe operation. Follow ALL Installation instructions carefully.
NEVER install an M-Series Impact Operation on ANY make, model or type of GEAR OPERATED valve.
To eliminate any possibility of the valve handwheel retaining nut backing off the stem, IT MUST HAVE A SET SCREW IN PLACE.
EVERY Impact Operator must be scheduled for REGULAR, PERIODIC inspection and maintenance.
Roto Hammer STRONGLY RECOMMENDS that EVERY overhead Impact Operator be fitted with a Roto Hammer Retaining Cable (available from H N Supplies).
Set screws and other threaded fasteners MUST be secure and tight.