AB 07 EN
Vent Plugs

Application
Vent plugs are screwed into the exhaust air ports of pneumatic, electropneumatic and electric devices. They ensure that any
exhaust air that forms can be vented to the atmosphere (toavoid excess pressure in the device). Furthermore, the ventplugs allow air intake to prevent a vacuum from forming inthe device.
Proper functioning must be ensured, even under rough environmental conditions. Additionally, the vent plugs prevent dirt

Vent plug for electric devices,u page 9

Check valve made of PA,u page 7

Special vent plug,u page 8and moisture entering the device. To meet special requirements, check valves can be used to allow air to pass throughin only one direction.
NoteThe sensitiveness to impact of vent plugs made of PA/PC
increases at temperatures below –20 °C.

Vent plug in versions for electric
devices,u page 10

Vent plug for pneumaticactuators,
u page 6

Stainless steel check valve,u page 7

Standard vent plug in versions forelectric devices,u page 2

Muffler for pneumatic or electropneumaticdevices,u page 12

Vent plug,u page 5

Stainless steel muffler,u page 13

Fig. 1: Overview

SAMSON AKTIENGESELLSCHAFT · Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany
Phone: +49 69 4009-0 · Fax: +49 69 4009-1507 · samson@samsongroup.de · www.samsongroup.com

Edition October 2023

Standard vent plug including version forelectric devices
Application
The vent plugs (1990-1714 and 1990-1715) are designed
for the exhaust air port of pneumatic actuators and otherdevices. The vent plug (1991-0451) can be used for electricor electropneumatic devices.

H1

ØDH2! NOTICE− The vent plug (1991-0451) is designed only for a small
difference pressure and a low air capacity. Therefore, it
must not be subjected to a pressure higher than the specified
exhaust air pressure pA.
− Influences, such as vibrations and changes in temperature,
may cause the vent plug to become loose. In this case, werecommend taking appropriate precautions, e.g by using
sealing tape or thread-locking fluid which is compatible withplastic.
− Make sure that a medium containing solid matter cannot
enter the vent plug and that the vent plug cannot get
blocked due to the formation of ice or layers of dust.

GFig. 2: Vent plug (1990-1715)

Technical data
Order no.

1990-1714

1990-1715

1991-0451

TypeVent plug

Vent plug

Vent plug for electric devices

MaterialPAPAPA

MediumInstrument air

Instrument air

Instrument air

Exhaust air pressure pA

6 bar

6 bar

≤ 1 bar

KVS

1.2

1.2

0.7

Ambient temperature–60 to +80 °C–60 to +80 °C–60 to +80 °C

Degree of protection

IP54

IP54

IP66

Tightening torque

≤4 Nm

≤4 Nm

≤4 Nm

Connecting thread GG ¼ 1)

G 3/8 1)G ¼ 1)

Outside diameter Ø D31 mm

31 mm

31 mm

Dimensions and weights

Height H1

23 mm

23 mm

23 mm

Height H2

33.5 mm33.5 mm33.5 mm

WeightApprox. 9 g

Approx. 10 g

Approx. 10 g

Packaging unit (10 pcs.)

1402-1329

1402-1330–

Logic symbol1)

2

Also fitting NPT connections

AB 07 EN

Vent plug in various versions for electric
devices made of stainless steel
Application
These vent plugs are used in electric and electropneumatic devices, such as solenoid valves, with stainless steel specifications.

Fig. 3: Vent plug (100056820)

Fig. 4: Vent plug (100056826)

Technical data
Order no.

100056820

100056824

Type100056826

2.76

2.41

Vent plug

Material

Stainless steel

Process medium

Instrument air

KVS

100056825

0.83

1.81

Ambient temperature–20 to +200 °C

Degree of protection

IP54

Dimensions and weights
Connecting thread G

G 1/8

G¼

G¼

G½

Outside diameter H

21.5 mm21.5 mm

30 mm

30 mm

Height L

29.5 mm

30 mm

38 mm

41 mm

Height A

13 mm

13 mm

21 mm

21 mm

Weight

41 g

42 g

75 g

104 g

Logic symbol

AB 07 EN3Stainless steel vent plug with pipe shaftLApplicationADH

These vent plugs are used when air purging of the actuator's
spring chamber is specified. The pipe shaft is inserted directly
into a screw fitting and fastened tight.

Fig. 5: Vent plug (100044355)

LD

HA

Fig. 6: Vent plug (100044356)

Technical data
Order no.

100044355

Type100044356
Vent plug with pipe shaft

Material

Stainless steel

Process medium

Instrument air

Ambient temperature–20 to +200 °C

Dimensions
Pipe shaft D

12 mm

20 mm

Outside diameter H

30 mm

58 mm

Height A

21 mm

39 mm

Height L

48 mm69 mm

Weight75 g

384 g

Logic symbol

4

AB 07 EN

Vent plugs
Application
The vent plug is designed for the exhaust air port of pneumatic devices.

ØDH1! NOTICE

H2− The vent plugs must not be subjected to a pressure higher
than the specified exhaust air pressure pA.
− Influences, such as vibrations and changes in temperature,
may cause the vent plug to become loose. In this case, we
recommend taking appropriate precautions, e.g by using
sealing tape or thread-locking fluid which is compatible withplastic.
− Make sure that a medium containing solid matter cannot
enter the vent plug and that the vent plug cannot get
blocked due to the formation of ice or layers of dust.

GFig. 7: Vent plug (1992-3966)Technical data
Order no.

1992-3965

1992-3966

Type

Vent plug

Vent plug

MaterialPA

PAMedium

Instrument air

Instrument air

Exhaust air pressure pA

6 bar

6 bar

KVS

0.75

1.1

–60 to +80 °C–60 to +80 °C

Ambient temperature
Degree of protection

IP54

IP54

Tightening torque

≤4 Nm

≤4 Nm

Connecting thread GG 1/8 1)

G ¼ 1)

Outside diameter Ø D22 mm

22 mm

Height H1

21 mm

21 mm

Dimensions and weights

Height H230 mm

30 mm

WeightApprox. 6 gApprox. 6 g

Packaging unit (10 pcs.)

1402-1327

1402-1328

Logic symbol1)

Also fitting NPT connections

AB 07 EN

5

Vent plugs for pneumatic actuatorsØDApplication

H1

The vent plugs are designed for the exhaust air port of large
pneumatic actuators due to the comparatively high KVS coefficient.

− The vent plugs must not be subjected to a pressure higher
than the specified exhaust air pressure pA.
− Influences, such as vibrations and changes in temperature,
may cause the vent plug to become loose. In this case, we
recommend taking appropriate precautions, e.g by using
sealing tape or thread-locking fluid which is compatible withplastic.
− Make sure that a medium containing solid matter cannot
enter the vent plug and that the vent plug cannot get
blocked due to the formation of ice or layers of dust.

H2! NOTICEGFig. 8: Vent plug (1992-3974)

Technical data
Order no.
Type

1992-3974

1992-3976

1992-3975

1992-3977

1992-3413

Vent plug for actuators Vent plug for actuators Vent plug for actuators Vent plug for actuators Vent plug for actuators

MaterialPC

PC/stainless steel

PC

PC/stainless steel

PC

MediumInstrument air

Instrument air

Instrument air

Instrument air

Instrument air

Exhaust air pressure pA

6 bar

6 bar

6 bar

6 bar

6 bar

KVS

1010

9.4

9.4

4.5

Ambient temperature–60 to +80 °C–60 to +80 °C–60 to +80 °C–60 to +80 °C–60 to +80 °C

Degree of protection

IP54

IP54

IP54

IP54

IP54

Tightening torque

≤4 Nm

≤4 Nm

≤4 Nm

≤4 Nm

≤4 Nm

Connecting thread G

G1

1 NPT

G¾¾ NPT

G½

Outside diameter Ø D

56.5 mm56.5 mm56.5 mm56.5 mm56.5 mm

Height H148 mm

70 mm

48 mm

68 mm

48 mm

Height H266 mm

95 mm

64 mm

88 mm

62 mm

WeightApprox. 66 g

Approx. 115 g

Approx. 66 g

Approx. 115 g

Approx. 66 g

Dimensions and weights

Logic symbol

6AB 07 EN

Check valves
GApplication
The check valves can be used with the following devices:

H2

Solenoid valves
Reversing amplifier
i/p converters
p/i converter
Pneumatic positioners
Electropneumatic positioners
Limit switches

H1–––––––

ØD

Fig. 9: Check valves (1790-7408 and 1790-9645)

The check valves are not suitable for use in the exhaust air
ports of pneumatic actuators.

G! NOTICE

H1

H2− The check valves must only be used in cases where the thecheck valves do not cause the backpressure to impair thefunctioning of the device.
− The check valves must not be mounted with the filter disk facing
upward.
− Check valves are not able to take on the function of venting
and air intake at the same time.
− Influences, such as vibrations and changes in temperature,
may cause the check valve to become loose. In this case, werecommend taking appropriate precautions, e.g by using
sealing tape or thread-locking fluid which is compatible withmaterial.
− Make sure that a medium containing solid matter cannot
enter the vent plug and that the vent plug cannot get
blocked due to the formation of ice or layers of dust.

ØDFig. 10: Check valves (1993-4965 and 1993-5038)

Technical data
Order no.
Type
Material

Housing
Filter disk

Medium1790-7408

1790-9645

1993-4965

1993-5038

Check valve

Check valveCheck valve

Check valve

PAPA

Stainless steel

Stainless steel

PEPEPEPE

Instrument air, free fromcorrosive substances

Instrument air, free fromcorrosive substances

Instrument air

Instrument air≤ 2.5 bar≤ 2.5 bar≤ 2.5 bar≤ 2.5 bar

Exhaust air pressure pA
KVS

1.1

1.1

1.1

1.1

Ambient temperature–60 to +80 °C–60 to +80 °C–60 to +80 °C–60 to +80 °C

Degree of protection

IP65

IP66, NEMA 4IP66

NEMA 4Tightening torque

≤4 Nm

≤4 Nm

≤6 Nm

≤6 Nm

Connecting thread GG ¼ 1)

G ¼ 1)

G ¼ 1)

G ¼ 1)

Outside diameter Ø D26 mm

26 mm

25 mm

25 mm

Height H1

16.5 mm

16.5 mm

16.5 mm

16.5 mm

Height H2

22.5 mm22.5 mm22.5 mm22.5 mm

Weight10 g

10 g

30 g

30 g

Dimensions and weights

Logic symbol1)

Also fitting NPT connections

AB 07 EN

7

Special vent plugs
Application
The vent plugs (1890-2940 and 1990-7637) can be used for
the Type 6134 p/i Converter.

GGØD

ØDH1

H1

H2

− The vent plugs (1890-2904 and 1990-7637) are designed
only for a small difference pressure and a low air capacity.
Therefore, they must not be subjected to a pressure higher
than the specified exhaust air pressure pA.
− Influences, such as vibrations and changes in temperature,
may cause the vent plug to become loose. In this case, we
recommend taking appropriate precautions, e.g by using
sealing tape or thread-locking fluid.
− Make sure that a medium containing solid matter cannot enter the vent plug and that the vent plug cannot get blocked
due to the formation of ice or layers of dust.

H2! NOTICEFig. 11: Vent plug (1890-2904)

Technical data
Order no.

1890-2904

TypeMaterial

Housing
Filter disk

MediumExhaust air pressure pA
KVS

1990-7637 1)

Vent plug

Vent plug

Stainless steel

Stainless steel

PEPE

Instrument air

Instrument air≤2.5 bar≤1.0 bar

1.1

Not specified

Ambient temperature–60 to +80 °C–60 to +80 °C

Degree of protection

IP54

IP65

Tightening torque

≤6 Nm

≤6 Nm

G ¼ 2)

G ¼ 2)

Dimensions and weights
Connecting thread G
Outside diameter Ø D

25 mm

25 mm

Height H1

16.5 mm

16.5 mm

Height H2

22.5 mm22.5 mm

WeightApprox. 28 g

Approx. 28 g

Logic symbol1)
2)

8

Only suitable for Type 6134 Electropneumatic Converter
Also fitting NPT connections

AB 07 EN

Vent plug for electric devices
Application

Note
The vent plug (1991-2110) is only available on request.

H1

ØDH2

! NOTICE− The vent plug is exclusively designed for electric devices andmust not be used for pneumatic devices.
− The vent plug (1991-2110) is designed only for a small
difference pressure and a low air capacity. Therefore, it
must not be subjected to a pressure higher than the specified
exhaust air pressure pA.
− Influences, such as vibrations and changes in temperature,
may cause the vent plug to become loose. In this case, werecommend taking appropriate precautions, e.g by using
sealing tape or thread-locking fluid.
− Make sure that a medium containing solid matter cannot
enter the vent plug and that the vent plug cannot get
blocked due to the formation of ice or layers of dust.

GFig. 12: Vent plug (1991-2110)

Technical data
Order no.
Type

1991-2110
Vent plug for electric devices

Material

1.4404

MediumInstrument air

Exhaust air pressure pA

6 bar

Ambient temperature–60 to +80 °C

Degree of protection

IP66

Outside diameter

22 mm

Tightening torque≤6 NmDimensions and weights
Connecting thread GG ¼ 1)

Outside diameter Ø D

22 mm

Height H1

8 mm

Height H2

13 mm

WeightApprox. 22 g

Logic symbol1)

Also fitting NPT connections

AB 07 EN

9Vent plug in various versions for electricdevices
Application
The vent plug (1690-3110) specially designed for electric devices can be used in positioners, limit switches, position transmitters and similar electropneumatic and electric devices.

ØDH2− The vent plug (1690-3110) is designed only for a small
difference pressure and a low air capacity. Therefore, it
must not be subjected to a pressure higher than the specified
exhaust air pressure pA.
− Influences, such as vibrations and changes in temperature,
may cause the vent plug to become loose. In this case, werecommend taking appropriate precautions, e.g by using
sealing tape or thread-locking fluid which is compatible withplastic.
− Make sure that a medium containing solid matter cannot
enter the vent plug and that the vent plug cannot get
blocked due to the formation of ice or layers of dust.

H1! NOTICEGFig. 13: Vent plug (0070-0773)

Technical data
Order no.

0070-0774

0070-0773

1690-3110

TypeVent plug

Vent plug

Vent plug for electric devices

Material

PC

PC

PC

MediumInstrument air

Instrument air

Instrument air

6 bar

6 bar

≤ 1 barExhaust air pressure pA
KVS

0.6

1.2

Not specified

Ambient temperature–60 to +80 °C–60 to +80 °C–60 to +80 °C

Degree of protection

IP42

IP42

IP65

Tightening torque

≤4 Nm

≤4 Nm

≤4 NmG 1/8 1)

G ¼ 1)

G ¼ 1)

Dimensions and weights
Connecting thread G
Outside diameter

20 mm

20 mm

20 mm

Height H1

6.5 mm

6.5 mm

6.5 mmHeight H2

13 mm

13 mm

13 mm

WeightApprox. 3 gApprox. 3 gApprox. 3 g

Logic symbol
1)

10Also fitting NPT connections

AB 07 EN

Venting pipe
Application
The venting pipe is screwed into the threaded connection on
the top diaphragm case of pneumatic actuators.
! NOTICE
The venting pipe must only be screwed into the threaded connection on the top diaphragm case with the open end of thepipe pointing downward.
NoteAn adapter is required to mount the pipe on actuators with
1400-120 cm² or larger (see table).

Selection of a suitable venting pipe
Actuator size
175 cm²
240 cm²
350 cm²
355 cm²
700 cm²
750 cm²
1000 cm²
1400-60 cm²

Connection size
ISO 228-1

G¼Adapter

Venting pipe–

1380-2588

NPT

¼-18–

1380-2594

ISO 228-1

G¼–

1380-2588

NPT

¼-18–

1380-2594

ISO 228-1

G

3/8–

1380-2589

NPT

3/8-18–1380-2595

ISO 228-1

G–

1380-2589

NPT

3/8-18–1380-2595

G 3/8–

1380-2589

ISO 228-1

3/8NPT

3/8-18–1380-2595

ISO 228-1

G

3/8–

1380-2589

NPT

3/8-18–1380-2595

ISO 228-1

G¾–

0400-9940

NPT

¾-14–

0401-2465

ISO 228-1

G¾–

0400-9940

NPT

¾-14–

0401-2465

1400-120 cm²

ISO 228-1

G18580-1050

0400-9940

2800 cm²

ISO 228-1

G18580-1050

0400-9940

2 x 2800 cm²

ISO 228-1

G18580-1050

0400-9940

NoteActuators with a diaphragm area of 1400-120 cm² to 2x 2800 cm² are fitted with a G connecting thread. Therefore, only venting
pipes with a G connecting thread are available.

AB 07 EN11Mufflers
Application
Mufflers are used in pneumatic and electropneumatic devices
to reduce the noise generated when compressed air is vented
to the atmosphere. These mufflers are designed for the exhaust air port of pneumatic devices.

Fig. 14: Muffler (8504-0066)

Technical data
Order no.

8504-0065

85040066

8504-0067

Type

8504-0068

8504-0069

8504-0070

7.7

9.4

Mufflers

Material

Polyethylene

Process medium

Instrument airKVS

0.9

1.6

3.3

4.8

Ambient temperature–70 to +80 °C 1)

Degree of protection

IP54 2)Dimensions
Connecting thread G

G 1/8G¼G 3/8G½G¾G1

Outside diameter Ø D

12.9 mm

16.6 mm

24.4 mm

24.8 mm37.6 mm

47.8 mm

Height H1

28 mm

35 mm

57 mm

68 mm

124 mm

136 mmHeight H2

34.5 mm

42 mm

67 mm

78 mm

139 mm

154 mmLogic symbol1)
2)

The air forced through the muffler is cooled down. At minus temperatures, the moisture contained in the air can freeze and block the pores inthe muffler.
The degree of protection IP54 can only be achieved when the following conditions are met:–––

12

The devices must be mounted in such a way that the muffler faces downward.
The muffler must be mounted properly using suitable tools and sealant to prevent thread galling (seizure).
If the muffler can become covered in snow, iced up or dirt can collect, it must be protected by a suitable fixture/cover.

AB 07 EN

Stainless steel mufflers
Application
These mufflers are suitable for the exhaust air ports of thefollowing devices:––

Volume boosters
Booster valvesFig. 15: Muffler (8504-1009)

Material: Al Mn 1Cu

Material: Al Cu Mg1Pb

Insidematerial:
Material
innen:
Ms-Sieb-Drahtgeflecht
Brassfilter wire meshFig. 16: Muffler (1136-0208)

Technical data
Order no.

8504-1009

8504-1010

Type1136-0208

1136-0213

Mufflers

Material

Stainless steel

Process medium

Instrument airKVS

Not specified

Not specified

16

16

Ambient temperature–10 to +400 °C–10 to +400 °C–20 to +80 °C–20 to +80 °C

Degree of protection

IP54

IP54

IP41IP411)

1)

Dimensions
Connecting thread G

G1

1 NPT

G1

1 NPT

Outside diameter Ø D35 mm

35 mm51 mm

51 mm

Height L

60.1 mm60.1 mm

138 mm

138 mmLogic symbol1)

The degree of protection IP54 can only be achieved when the following conditions are met:
– The devices must be mounted in such a way that the muffler faces downward.
– The muffler must be mounted properly using suitable tools and sealant to prevent thread galling (seizure).
– If the muffler can become covered in snow, iced up or dirt can collect, it must be protected by a suitable fixture/cover.

AB 07 EN13

AB 07 EN

2023-11-07 · English

Specifications subject to change without notice