AB 08 EN
Filter Check Valve
Integrated into a screw-on body with G ¼ thread, degree of protection IP 56/66 or NEMA 4Application
The filter check valve is installed in the exhaust air connection of pneumatic and electropneumatic devices (see Application
notes on page 2) to ensure functional safety of these devices in rough ambient conditions. It reliably prevents dust andjets of water from entering the device.

Special features•• Can be used in devices with an exhaust air pressure≤2.5 bar•• Screw-on body with G ¼ thread, made of 1.4305 orpolyamide•• Degree of protection IP 65/66 or NEMA 4 when mounted•• Ambient temperature –45 (–20) to +80 °C
The filter check valve consists of a diaphragm (1) and a filter
disk (2) integrated into a screw-on body. The exhaust air fromthe device flows across the diaphragm (1) through the filter
disk (2) to the atmosphere. In the reverse direction of flow, theexhaust air port is sealed by the diaphragm (1) to prevent
dust or water entering the device mounted to it.
Technical data
7253

9646

7408

Instrument air, free from corrosive substances

Exhaust air pressure pA≤2.5 bar

KVS 1)

1.1 · The user must check whether the arising backpressure can impair the functioning of the device
when the filter check valve is installed (see Application notes).

Mounting position

Not with filter disk on top · Make sure that the filter
disk cannot be covered by dirt, snow etc. when thedevice is installed outdoors.

Connection

19645

Process medium

ø61790-Fig. 2: Logic symbol

SW 23
G 1/4

Order no.

Fig. 1: Filter check valve

2� pA

25

Function

G ¼Tightening torque

≤6 Nm

≤4 Nm

MaterialDiaphragm

Silicone rubber 2), not compatible with paint

Filter disk

Polyethylene, average pore size 80 µm

Screw-on body1.4305

Polyamide

Ambient temperature–45 to +80 °C–20 to +80 °C

Degree of protection
Weight1)2)

approx.

IP 66

NEMA 430 g

IP 65

NEMA 410 g

The air flow rate when p1 = 2.4 bar and p2 = 1.0 bar is calculated using
the following formula: Q = KVS x 36.22 in m³/h.
A polyethylene filter (order no. 1099-1103) with a protective metal cap,
G ¼ connection, degree of protection IP 65, is available for silicone-freeapplications.

916,522,5––– O-Ring
O-ring 13x1.5
made of 1.4305aus WN 1.4305
13 1,5withbeibody
Einschraubgehäuse––– Dichtkante
Facing with bei
polyamide
bodyEinschraubgehäuse
aus Polyamid––– Dichtung
Seal with polyamide
body (only withaus
degreeof protection
bei Einschraubgehäuse
PolyamidNEMA 4)(nur in Schutzart NEMA 4)

Fig. 3: Functional diagram and dimensions (in mm)

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

Edition June 2019

Application notes

Ordering data

The filter check valve can be used for the following devices:

Filter check valve integrated into a screw-on body with G ¼
thread–– Solenoid valves (e.g. Types 3701, 3963 and 3966)–– i/p converters (e.g. Types 6116 and 6126)–– p/i converters (e.g. Type 6134-04)–– Pneumatic positioners (e.g. Types 3766 and 4765)–– Electropneumatic positioners (e.g. Types 4763, 3767,3725 and 3730)–– Limit switches (e.g. Type 3776)
When the pressure and flow rate of the air exhausted from thedevice to be protected are unknown, check to ensure that theinstalled filter check valve does not impair the functioning ofthe device. Proceed as follows:
1. Use a tee to connect the filter check valve and a pressuregauge to the exhaust air connection of the device.
2. Apply the supply air at the operating pressure specified
for the device.
3. Place the device in a state at which the largest exhaust airflow is produced.

–– 1.4305, degree of protection IP 66
Order no. 1790-7253–– Polyamide, degree of protection IP 65
Order no. 1790-7408–– 1.4305, degree of protection NEMA 4
Order no. 1790-9646–– Polyamide, degree of protection NEMA 4
Order no. 1790-9645
Spare parts–– O-ring 13x1.5, NBR(for screw-on body with G ¼ thread made of 1.4305)
Order no. 8421-0327–– ECO seal(for screw-on body with G ¼ thread made of polyamide,degree of protection NEMA 4)
Order no. 0430-2807

Specifications subject to change without notice

AB 08 EN

2019-07-16 · English

4. Check whether the device functions properly and the exhaust air pressure does not exceed 2.5 bar.