This pump is of spring-back, direct-acting diaphragm, fixed-displacement type. The resin-made fluid-contact section has been successfully modified to be simple and solid. Flange (JIS10K) are used for pipe connections, as standard design-less damage-prone and much easier to handle compared the former series.


Low-pressure large-capacity pump of Tohkemy

Discharge quantity is a lot, this dosing pump suitable for use in discharge pressure is low (Less than 0.3MpaG).
Compared with same size of CM-L as large series, possible to discharge will be large as low power source.

Power source specification

Various power source motors lined up as standard and semi-standard.
・200V  ・220V  ・380V  ・400V  ・415V  ・420V  ・440V

Possible to be supported with different voltage and explosion proof type.
Please contact to confirm us about delivery terms.

Outdoor specifications

Totally-enclosed fan-cooled (TEFC) outdoor flange type motor.

Possible to be equipped with coupling connection.

The pump can be equipped with a safety-increase explosion-proof motor, a pressure and explosion proof motor and other designated motor by coupling connection.

Protect option (Double diaphragms)

Normally pump diaphragm is single. The double –diaphragm design that possible to protect the reduction gears from corrosive liquid leak which might be caused by the damage of the diaphragm. For the option only, ready to install the double diaphragm.

●Applicable to CM-27R, CM-34R, CMD-54R, CMD-68R (except for V4U6 combination)

Air Chamber standard accessory


Model Discharge
at 0.1MPaG
Max. discharge rate
at the max.
discharge pressure
Diameters of Pump
/ Diaphragm (mm)
Number of
strokes spm
(Reduction ratio)
Max. stroke
length (mm)
(JIS 10K)
60Hz 50Hz 60Hz 50Hz
CM-4R 0.8 – 4 0.7 – 3.3 3.6 3 0.5 120 170/140
6.5 20A 0.2/4P 20/26 3B×400
CM-6R 1.2 – 6 1 – 5 5.2 4.4 140 25A 22/30 4B×400
CM-9R 1.8 – 9 1.5 – 7.5 7.6 6.3 10 0.4/4P 31/39
CM-14R 2.8 – 14 2.4 – 12 13 11 0.3 160 40A 32/45 4B×600
CM-16R 3.2 – 16 2.7 – 13 14 12 12
CM-22R 4.4 – 22 3.6 – 18 20 17 180 0.75/4P 39/54 6B×600
CM-27R 5.4 – 27 4.4 – 22 25 21 200 42/59
CM-34R 6.8 – 34 5.6 – 28 32 26 220 50A 45/65 8B×600
CMD-32R 3.2 – 32 2.7 – 26 28 24 160 Double-head 40A Double-head 0.4/4P 42/68 4B×600 Double-head
CMD-44R 4.4 – 44 3.6 – 36 40 33 180 0.75/4P 51/82 6B×600
CMD-54R 5.4 – 54 4.4 – 44 51 42 200 55/90
CMD-68R 6.8 – 68 5.6 – 56 63 53 220 50A 62/110 8B×600

◯The discharge rate was calculated at discharge pressure of 0.1MPaG, suction head of -0.01MPaAq equivalent to the same pipe diameter as in the pump; and normal temperature using clear water. When your pump is of the standard specifications, use it in the ambient temperature range of 0-40℃, the liquid temperature range of 0-50℃ and about 0.06MPaA (0.6kgf/cm2A) of NPSH req.

Common specifications

Motor Standard 0.2 to 0.4kW: Three-phase, 4P, class E, 60Hz (200, 220V), 50Hz (200V), TEFC outdoor flange type
0.75 kW: Three-phase, 4P, class F, 60Hz (200, 220V), 50Hz (200V), TEFC outdoor flange type
Semi-standard 0.2 and_ 0.4kW: Three-phase, 4P, class E, 60Hz (400, 440V), 50Hz (400V), TEFC outdoor flange type
0.75kW: Three-phase, 4P, class F, 60Hz (380, 400, 440V), 50Hz (380,400, 415, 420V), TEFC outdoor flange type
Reducer Planetary gear speed reducer, lubricated with molybdenum grease
Standard accessories Air chamber, Simple tools, Mounting bolts and_ nuts (washer with M8 x 30L) x 4 sets, Instruction manual
Color Munsell 2.5PB 2.5/7 for reducer, Munsell N7 for motor


Simple comparison table for large-capacity diaphragm pumps

Model Stroke frequency
Normal pressure
Discharge accuracy Air chamber
R type 170/140(60/50Hz) 0.2-0.3 ±5% Necessary
L type 56-108/47-89(60/50Hz) 0.3-0.5 ±2%

Pump dimensions

Liquid-end parts construction

Liquid-end parts specifications

Part name / combination VV46 VVYY VVC 4446 V4U6
Applicable chemicals High viscosity liquid,
Sodium hydroxide,
Ammonia water
Sodium hypochlorite, Sulfurous acid, Hydrochloric acid, Nitric acid, Ferric chloride, PAC, Ferrous / Ferric sulfate, Sulfuric acid band, Chromic acid methanol,
Organic solvent solution
Slaked lime solution,
Sludge liquor
Pump head PVC SUS304 PVC
Diaphragm PTFE Urethane/PTFE
Valve case PVC SUS304 PVC
Valve guide, PVC SUS304
Check ball SUS304 Hastelloy C Ceramics SUS304 Urethane
O-ring Aflas® PTFE Aflas®
Spring SUS316 Hastelloy C SUS316

◯Take this table as a general guide, because the material corrosion depends on liquid temperature and concentrations. Other combinations of materials than above are also available.
◯Aflas® is a registered trademark of AGC Inc.

Head Office

1-12-11 Tagawakita, Yodogawa-ku,Osaka

Overseas Business Department

TEL +81-6-6301-6460
FAX +81-6-6308-3022