Products
 

Cylinder Variants

Cylinders are of various types based on their applications. These are as follows:

 

1) Double Acting Cylinder: 

These cylinders have power strokes in both directions (viz. Forward and return motion). Compressed air is let in through both the ports alternately to achieve the above result. Alternate air supply to the cylinder is achieved by a 5 port / 4 port valve as illustrated in the section for valves. 

2) Single Acting Cylinder: 

These cylinders have power strokes in one direction only.Return Types available are:a) Sping return: 1) Air to forward piston / spring to return piston.2) Air to retract piston / spring to forward piston. b) Return by external load: Air to forward or return piston and original position achieved by external load.

 
Power Stroke in single acting cylinder is achieved only in one direction of piston movement. Return stroke is achieved by any of the methods mentioned above. Seed and pull force of return stroke is dependent on the stiffness of the spring used and the mode of flow control available. These cylinders are used in applications where the piston is to be in the original / neutral position in the case of power failures etc.
 

3) Double Ended Cylinder :

The piston rod in this case is extended from both the sides of the piston and the power stroke is available in both the directions. An example could be the clamping of the workpiece to be moved onto the cylinder body rather than the piston shaft.

 

4) Tandem Cylinder:

These are two double acting cylinders coupled together with a common piston rod and find applications where there is space constraint to use a larger bore for achieving the requisite force. The force achieved by a tandem cylinder is 1.8 times that of a double acting cylinder of the same bore eg.force obtained by 200 mm bore cylinder at 5 bar is around 1.6 tonnes. This same force can be obtained using a tandem cylinder of bore size 150 mm.

 

5) Continuous Reciprocating Type:

Also known depicted as linear air motor, these units are self reciprocating air cylinders which require no external valves or limit switches. Just one air input is required to operate the cylinders. Speed of forward and return stroke can be adjusted by the flow control valves mounted on the cylinders.

 

6) Valve Mounted Cylinder:

This incorporates a double acting cylinder with valve mounted directly on it. This avoids excessive piping as just an inlet pressure is required to be given to the inlet of the valve. Outlets ports of the valve are pre-connected to the ports of the cylinders. This cylinder is not continuously reciprocating type. On / Off switches are required to enable the forward and return stroke.

 

7) Feed Control Cylinder:

In general applications, the speed of a cylinder can be controlled using flow control valves. However, in applications which require very precise speed control without jerks, the feed control cylinder is recommended. Hydro-pneumatic system provided in the cylinder enables achievement of velocities as low as 50 mm per minute.

 
Working Characteristics of Pneumatic Cylinder
Material Specification:
Cylinder tube Seamless hard drawn low carbon steel tube, honed and hard chrome plated internally to 60 RC increases seal life. Bores: 40 to 300 mm.Seamless Hard drawn brass tube internally polished : Bores : 19 to 65 mm
Piston rod EN8 ground, micro finished and hard chrome plated for lasting seal life and corrosion resistance.
Seals Piston and cushion seals made from a wear resistant nitrile rubber compound. The double lip seal design automatically self compensates against wear.
Piston Cast iron
End covers Cast iron oxidised to prevent corrosion
 
Media Air, Oil and inert gas
Temperature range -20 to 85 degrees cen.
Pressure 150 p.s.i. / 10 bar
Cushioning available in bore sizes 32 and above only.
Note: The internal finish of brass tube has been known to improve in continuous operation with the passage of time thereby reducing friction.
 

direction control valves

Direction Control Valves are used for operating air / power cylinders. It is a prerequisite to identify the correct type of valve suitable to the relevant application. A detailed description of the types of valves and their application is illustrated below:

 

1) SPOOL TYPE: SERIES 11

2) DIRECT ACTING TYPE: SERIES 12

3) POPPET TYPE: SERIES 16

 

SPOOL TYPE VALVES (SERIES 11)

The movement by the piston in the cylinder is achieved by the alternate flow of compressed air guided by the position of the spool in the valve. The position of the spool is governed by external means of actuation which could be manual or electrical.

 

Selection of spool valve is based on the following criteria:

1) FORWARD OPERATING MECHANISM OF SPOOL

2) RETURN OPERATING MECHANISM OF SPOOL

3) NUMBER OF PORTS

4) NUMBER OF POSITIONS

5) PORT SIZE

 
1) FORWARD OPERATING MECHANISM OF SPOOL 2) RETURN OPERATING MECHANISM OF SPOOL

ACTUATION

TYPES

ACTUATION

TYPES

MANUAL

Hand Lever / Foot Pedal / Palm

MANUAL

Hand Lever / Foot Pedal / Palm

SOLENOID COIL

6 to 220 V D.C. 6 to 400 V A.C.

SOLENOID COIL

6 to 220 V D.C. 6 to 400 V A.C.

PILOT AIR

External

PILOT AIR

External

MECHANICAL

Roller / Roller Lever

MECHANICAL

Roller / Roller Lever

 
3) NUMBER OF PORTS

No. of Ports

Types

PP: Pressure port
(pressure line in)

4) NUMBER OF POSITIONS: (a) Two position, (b) Three position

 

5) PORT SIZE: Indicates the size of the ports of the valve to which pipe fittings are made. Where it is required to have higher flow rate, it is taken as a rough assumption that the larger the port size, higher is the flow rate leading to increase in linear speed of cylinder. "LUTHRA" make offers port valve sizes ranging from 1/8" B.S.P. to 3/4" B.S.P.

2 Ports

1 PP / 1 OP

OP: Outlet port

3 Ports

1 PP / 1 CP / 1 EP

EP: Exhaust port

5 Ports

1 PP / 2 CP / 2 EP

CP: Compressor port

 
SERIES 11: SPOOL OPERATED VALVES
GENERAL VALVE CHARACTERISTICS HANDLEVER OPERATED:

BODY ALUMINIUM HARD ANODIZED
SPOOL ENB HARD CHROME PLATED
SEALS NITRILE / VITON
TEMPERATURE -10 TO 80 / -10 TO 250 DEG. CEN.
PORT SIZE 1/4", 3/8", 1/2" B. S. P.
MEDIA AIR / FLUID *
PRESSURE RANGE AS PER TYPE OF VALVE
*: fluid media application valid for all spool valves except for 3 port & 5 port solenoid operated valves
 
FOOT OPERATED VALVE   PALM BUTTON OPERATED
 

TYPE

SIZE

A

B

C

D

1) 5/2 Spring return

1/4"

134

25

50

214

3/8"

216

38

68

320

1/2"

216

38

68

320

4) 3/2 Spring return

1/4"

110

25

50

190

3/8"

176

38

68

280

1/2"

176

38

68

280

 
Pressure range 0 to 10 bar

TYPE

SIZE

A

B

C

D

1) 5/2 Spring return

1/4"

175

25

50

15

3/8"

255

38

68

15

1/2"

255

38

68

15

2) 5/2 Detent type

1/4"

170

25

50

15

3/8"

250

38

68

15

1/2"

250

38

68

15

4) 3/2 Spring return

1/4"

150

25

50

15

3/8"

215

38

68

15

1/2"

215

38

68

15

5) 3/2 detent

1/4"

155

25

50

15

3/8"

220

38

68

15

1/2"

220

38

68

15

 
Pressure range 2 to 10 bar

TYPE

SIZE

A

B

C

D

1) 5/2 Spring return

1/4"

134

25

50

120

3/8"

216

38

68

150

1/2"

216

38

68

150

2) 5/2 Detent type

1/4"

138

25

50

120

3/8"

209

38

68

150

1/2"

209

38

68

150

3) 5/3 Detent

1/4"

138

25

50

120

3/8"

209

38

68

150

1/2"

209

38

68

150

4) 3/2 Spring return

1/4"

109

25

50

120

3/8"

175

38

68

150

1/2"

175

38

68

150

5) 3/2 Detent

1/4"

1131

25

50

120

3/8"

179

38

68

150

1/2"

179

38

68

150

6) 3/3 detent

1/4"

113

25

50

120

3/8"

179

38

68

150

1/2"

179

38

68

150

 
SERIES 11: SPOOL OPERATED VALVES
DOUBLE PILOT SINGLE PILOT

PRESSURE RANGE 2 to 10 bar PRESSURE RANGE 2 to 10 bar
TYPE

SIZE

A

B

C

TYPE

SIZE

A

B

C

1) 5/2 Detent type

1/4"

138

30

50

1) 5/2 Spring return

 

 

1/4"

138

25

50

3/8"

216

38

68

3/8"

216

38

68

1/2"

216

38

68

1/2"

216

38

68

2) 3/2 detent

1/4"

115

30

50

4) 3/2 Spring return

 

 

1/4"

113

25

50

3/8"

176

38

68

3/8"

176

38

68

1/2"

176

38

68

1/2"

176

38

68

 
ROLLER OPERATED ROLLER REVER OPERATED

PRESSURE RANGE 0 to 10 bar PRESSURE RANGE 0 to 10 bar
TYPE

SIZE

A

B

C

D

TYPE

SIZE

A

B

C

1) 5/2 Spring return

1/4"

140

25

50

5

1) 5/2 Spring return

1/4"

150

50

25

3/8"

222

38

68

5

1/2"

222

38

68

5
4) 3/2 Spring return

1/4"

125

25

50

5

4) 3/2 Spring return

1/4"

125

50

25

3/8"

180

38

68

5

1/2"

180

38

68

5
 
SERIES 11: SPOOL OPERATED VALVES

  COIL CHARACTERISTICS

  COIL

  EPOXY MOULDED (WEATHER PROOF)

  COIL HOUSING

  HARD CHROME PLATED

  VOLTAGE

  6 TO 440 V a.c. / 6 TO 220 V d.c.

  POWER CONSUMPTION

  11 WATTS

  INSULATION

  CLASS 'H'

 
SINGLE SOLENOID OPERATED DOUBLE SOLENOID OPERATED
TYPE

SIZE

A

B

C

D

TYPE

SIZE

A

B

C

D

1) 5/2 Spring return

1/4"

145

30

50

105

1) 5/2 Retaining type

1/4"

164

30

50

105

3/8"

216

38

68

105

3/8"

216

38

68

113

1/2"

216

38

68

105

1/2"

216

38

68

113

3/4"

250

42

85

117

3/4"

246

42

85

117

2) 3/2 Spring return

1/4"

125

30

50

105

2) 5/3 Spring centered

1/4"

194

30

50

105

3/8"

260

38

68

113

3/8"

216

38

68

105

1/2"

260

38

68

113

4) 3/2 Retaining type

1/4"

140

30

50

105

3/8"

175

38

68

113

1/2"

175

38

68

113

1/2"

216

38

68

105

5) 3/3 Spring centered

1/4"

170

30

50

105

3/8"

220

38

68

113

1/2"

220

38

68

113

 
  Pressure range

2 to 10 bar

    Pressure range

  1/4", 3/8", 1/2"

2 to 10 bar

  1/4", 3/8", 1/2"

1.5 to 10 bar

  3/4" B.S.P.

4 to 10 bar

 

2.5 to 10 bar

Top
Powered By : http://www.calcuttayellowpages.com