DFM-20-30-B-PPV-A-GF - Industrial pneumatic component Festo - Free user manual and instructions

Product Type	Guided Cylinder
Series	DFM
Bore	20 mm
Stroke	30 mm
Cushioning	PPV (Adjustable end-position cushioning)
Variant	A
Seal Version	GF (Grease-lubricated)
Operating Pressure	1 to 10 bar
Temperature Range	-20 to 80 °C
Action	Double-acting
Guide Type	Linear ball bearing
Housing Material	Aluminum alloy
Piston Rod Material	Steel
Pneumatic Connection	G1/8
Weight	Approx. 0.3 kg
Mounting	Via threaded holes or accessories
Piston Rod Rotation	Non-rotating
Lubrication	Pre-lubricated, no additional oil required
Maintenance	Low maintenance; clean compressed air recommended
Safety Notes	Do not exceed max pressure; use filtered air
Spare Parts	Available (seals, piston rod, etc.)
Repairability	Yes, exchange of seals and guide elements
Cleaning	Wipe with damp cloth; avoid solvents

Frequently Asked Questions - DFM-20-30-B-PPV-A-GF Festo

What is the operating pressure range of the Festo DFM-20-30-B-PPV-A-GF?

The operating pressure range is 1 to 10 bar. Always stay within this range to ensure proper function and avoid damage.

Can I use this cylinder without additional lubrication?

Yes, the cylinder is pre-lubricated and designed for oil-free operation. However, using lubricated air is permissible if compatible with the seals.

What is the temperature range for the DFM-20-30-B-PPV-A-GF?

The allowable ambient and media temperature range is -20 to 80 °C. Extreme temperatures may affect performance.

How do I adjust the cushioning on this cylinder?

The PPV cushioning is adjustable via screws at both ends. Turn clockwise to reduce cushioning, counterclockwise to increase. Refer to manual for precise adjustment.

What type of mounting options are available?

The cylinder can be mounted using threaded holes on the body or with accessories like foot mounts, flange mounts, etc. Check the manual for compatible mounting kits.

Is the piston rod resistant to rotation?

Yes, it features a non-rotating piston rod thanks to the integrated linear guide. This ensures precise linear motion without rotation.

What maintenance is required?

The cylinder is low-maintenance. Regularly check for leaks, clean the exterior, and ensure the compressed air is filtered and dry. Replace seals if worn.

Can I repair the DFM-20-30-B-PPV-A-GF?

Yes, it is repairable. Spare parts such as seal kits, piston rod, and guide elements are available. Disassembly instructions are in the manual.

What is the exact weight of this cylinder?

The approximate weight is 0.3 kg. For precise values, refer to the technical data sheet.

What pneumatic connection size does it use?

The connection size is G1/8. Use appropriate fittings and tubing of matching size.

USER MANUAL DFM-20-30-B-PPV-A-GF Festo

Assembly instructions (Original instructions)

8063354

2017-04e [8065800

FESTO

Guide unit

DFM-...-B

Festo SE & Co. KG

Ruiter Straße 82

73734 Esslingen Germany

[phone]

www.festo.com

1. Applicable documents

All available documents for the product → www.festo.com/pk

2. Safety

- Switch off compressed air before mounting work.

- Protect the positioning range from access.

- Keep foreign objects out of the positioning range.

3. Intended use

Stop, stopper cylinder or a single-axis feeding unit with larger loads on the yoke plate.

4. Further information

Characteristic curves and permissible limits → www.festo.com/catalogue Accessories (e.g., slot cover ABP) → www.festo.com/catalogue

1. Scope of delivery
   

1. Not in scope of delivery
   

7 Screw (2x)

1) Required surface (I) evenness precision only in case of the GF variants:

DFM-12 ... 20-B = 0.02 DFM-25 ... 63-B = 0.05

In case of non-observance of the evenness precision, guide rods can become jammed.

2) The usage of centring sleeves is not possible for DFM-20 ... 40-B and mounting variant d

3) In the case of DFM-...-B-...-E], the mounting variant d) is possible only to a limited extent,

since the fastening holes are largely covered.

4) Additional, required dimensions of the guide units 1 through 5 can be found in the

catalogue (→ www.festo.com/catalogue)

7. Mounting, general

→ Note

In order to avoid operative malfunctions and increased wear:

- Observe the characteristic curves and permissible limits

- Handle the guide units 1 through 5 in such a way that the guide rods and piston rod are not damaged.

• Ensure that the mounting surfaces (H) and (I) are flat.

• Install guide units 1 through 5 without distortion

Mounting variants:

a) Flat from on top

c) Lateral from underneath

b) Flat from underneath

- Use the following screws 7 and centring sleeves 6, depending on the mounting variant:

DFM----B (a) b) c) + d) Yoke plate (J)
12	M4	ZBH-9	M5	ZBH-9	M4	ZBH-5		M4
16		M6		ZBH-7	M5
20	M5					2)		ZBH-9
25					M6
32	M6	ZBH-12	M8	ZBH-12		ZBH-92)
40					M8
50						ZBH-12	M8	ZBH-12
63	M8		M10	M10		M10

- Provide mounting holes for the centring sleeves 5 on the surfaces (H) and (I) ^4 .

ZBH		5	7	9	12	15
D1 ^H7	[mm]	5	7	9	12	15
T1 min.	[mm]	1.4	1.4	1.9	2.4	2.9

i Information

To mount guide units 1 through 5:

- If possible, use screws 7 with a screw-in length of 1.5 × d^4 .

- Fasten the guide unit according to load, size and stroke length, but with at least 2 screws 7.

X=1.5

→ Note

To mount the variant d):

With protruding guide rods in the retracted state:

- Ensure there is clear passage of the guide and stop rods, e.g. through grooves in the mounting surface (H).

8. Mounting the proximity sensors

When intermediate strokes are being sensed, the proximity sensor can be at the level of a fastening hole (K) and not fastened.

• Take the following assembly alternatives e) through g) into consideration:

e) Offset the proximity

sensor 8 within its

operating path (b) by 6 mm.

f) Rotate the proximity

sensor 8 by 180°.

g) Select another permissible proximity sensor

(→ www.festo.com/catalogue)

- As required, cover the sensor slots with a slot cover ABP 9 and use them to fix the cables into place (→ More detailed information).

9 Stroke adjustment

9a. For guide units 2 through 4 (no metallic stop)

• Vent the guide units 2 through 4.

→ Note

To avoid the unintentional loosening of the piston rod:

- When loosening and tightening the lock nut (F), counterhold the stop nut (G).

Retracted end position (EJ)

Loosen the lock nut (D).Adjust the stop rod (Y) with the internal hexagon socket (E).Shorten the stroke by a maximum of 10 mm.	Loosen the lock nut (F).Adjust the stop nut (G).Shorten the stroke by a maximum of 10 mm.
Tighten the lock nut (D). Observe the tightening torque M_M1 (→ Table).	Tighten the lock nut (F). Observe the tightening torque M_M2 (→ Table).

- Vent the guide units 2 through 4

• Start the test run. Check the set stroke.

5) Tolerance for tightening torques M_A with no indication of tolerance: ± 20%

9b. For guide unit 5 (metallic stop)

DFM-...-B-YSRW

- Vent the guide unit 5.

→ Note

• To reduce the shortening of the stroke dimension a by a maximum of 10 mm

and enlarge it by dimension I by a maximum of 10 mm (→ Section 11).

- Do not exceed fall short of dimension a/l since the shock absorber

performance is otherwise strongly reduced.

- Adjust the shock absorber (B) to dimension a/l as follows:

Retracted end position

Loosen the lock nut (A)/screw (C).Adjust the shock absorber (B).Observe dimension a. Shortened the factory-set stroke by a maximum of 10 mm (→ Table).	Loosen the lock nut (A)Adjust the shock absorber (B).Observe dimension l. Increase the factory-set stroke by a maximum of 10 mm (→ Table).
Tighten the lock nut (A)/screw (C).Observe the tightening torque M_A1 (→ Table).	Tighten the lock nut (A). Observe the tightening torque M_A2 (→ Table).

- Vent the guide unit 5.

• Start the test run. Check the set stroke.

10. Maintenance and care

10a. In case of guide unit 5

During operation, the viscosity of the hydraulic oil reduces due to friction heat.

→ Shock absorber reset times become shorter (hard knocking).

At low temperatures around 0°C, the viscosity of the hydraulic oil rises.

→ Shock absorber reset times become longer.

The moving mass should always reach the end position safely, but not knock hard against it.

• The shock absorbers should be replaced when their functioning / shock-

absorbing performance is no longer ensured due to excessive wear.

- Check the cushioning regularly for the following signs of wear:

– Oil leakage

– Hard knocking

- Stop rod remains in retracted end position / moves slowly from end

position

• The following environmental conditions shorten the test intervals:

– High thermal stress

– Severe accumulation of dirt

– Proximity of grease-dissolving liquids or vapours.

• Exchange the shock absorber (B) after 10 million strokes (→ Section 9b).

1. Dimensions, widths across flats and tightening torques M_A^5)

DFM----B			12/16	20	25	32	40	50	63
EJ	D	⩽≦	–	8	13	13	13	17	17
	M_b1	[Nm]	–	3	7	10	10	24	24
	E	⩽≦	–	2.5	4	4	4	5	5
AJ	F	⩽≦	10	13	17	17	17	19	19
	M_b2	[Nm]	1.7	3	6	10	10	16.5	19
	G	⩽≦	17	19	24	30	30	36	36
YSRW	A	⩽≦	–	15	17	19	27	27	32
	M_b1	[Nm]	–	5	8	20	35	35	55
	B	⩽≦	–	11	13	15	20	20	24
	C	⩽≦	–				4	–
	M_b2	[Nm]	–				10	–
	a	[mm]	–	34.10	37.1.10	48.1.10	56.5.10	58.5.10	74.10
	I	[mm]	–	4.9.10	5.2.10	4.7.10	3.2.10	10.4.10	11.2.10