Breather Valve Caps EN 774.2

Original design SFW-P. / SFW-P+a

Type: A - Without dipstick

Fluid Level Markings / Special Lengths GN 109 Plastic Characteristics

Product description

Breather valve caps EN 774.2 are used when ventilation should only take place once the pressure exceeds or falls below a certain opening pressure. Further details on function and application criteria can be found in the Functional Description.

Breather valve caps can be fastened by means of a thread or combined with a filler strainer (EN 664 or EN 664.1). Line markings for monitoring the fill level can be easily applied to the dipstick surface.

Specification

Housing
Plastic, polyamide (PA)

Upper part (cap)
Orange, RAL 2004, matte finish
Lower part (threaded part)
Black, matte finish

Seal
Acrylonitrile butadiene rubber (NBR)

Air filter
Polyester
Filtration 10 µm

Dipstick for type B
Steel, phosphate-treated

Operating temperature
-22 °F to 212 °F (-30 °C to +100 °C)

RoHS

Accessory

EN 664 Filler Strainers (Vertical Installation)
EN 664.1 Filler Strainers (Side Installation)

Your Contact

You are looking for a Winco partner near you?

Part Number A - Without dipstick	Part Number B - With dipstick	d₁	d₂		Opening pressure in mbar	d₃	d₄	l₁	l₂	l₃


774.2-42-M16X1.5-A		1.65	-	M 16 x 1.5	350	0.45	1.57	0.45	1.42	-
	774.2-42-M16X1.5-B	1.65	-	M 16 x 1.5	350	0.45	1.57	0.45	1.42	7.64
774.2-42-G3/8-A		1.65	G 3/8	-	350	0.51	1.57	0.45	1.42	-
	774.2-42-G3/8-B	1.65	G 3/8	-	350	0.51	1.57	0.45	1.42	7.64
774.2-42-G1/2-A		1.65	G 1/2	-	350	0.59	1.57	0.45	1.42	-
	774.2-42-G1/2-B	1.65	G 1/2	-	350	0.59	1.57	0.45	1.42	7.64
774.2-42-M20X1.5-A		1.65	-	M 20 x 1.5	350	0.59	1.57	0.45	1.42	-
	774.2-42-M20X1.5-B	1.65	-	M 20 x 1.5	350	0.59	1.57	0.45	1.42	7.64
774.2-42-G3/4-A		1.65	G 3/4	-	350	0.83	1.57	0.45	1.42	-
	774.2-42-G3/4-B	1.65	G 3/4	-	350	0.83	1.57	0.45	1.42	7.64
774.2-57-G3/4-A		2.24	G 3/4	-	350	0.75	2.20	0.51	1.87	-
	774.2-57-G3/4-B	2.24	G 3/4	-	350	0.75	2.20	0.51	1.87	7.48
774.2-57-G1-A		2.24	G 1	-	350	1.04	2.20	0.51	1.87	-
	774.2-57-G1-B	2.24	G 1	-	350	1.04	2.20	0.51	1.87	7.48
774.2-70-G3/4-A		2.76	G 3/4	-	350	0.81	2.70	0.63	2.32	-
	774.2-70-G3/4-B	2.76	G 3/4	-	350	0.81	2.70	0.63	2.32	7.48
774.2-70-G1-A		2.76	G 1	-	350	1.04	2.70	0.67	2.32	-
	774.2-70-G1-B	2.76	G 1	-	350	1.04	2.70	0.67	2.32	7.52
774.2-70-G11/4-A		2.76	G 1 1/4	-	350	1.32	2.70	0.67	2.32	-
	774.2-70-G11/4-B	2.76	G 1 1/4	-	350	1.32	2.70	0.67	2.32	7.52
774.2-70-M42X2-A		2.76	-	M 42 x 2	350	1.32	2.70	0.67	2.32	-
	774.2-70-M42X2-B	2.76	-	M 42 x 2	350	1.32	2.70	0.67	2.32	7.52
774.2-70-G11/2-A		2.76	G 1 1/2	-	350	1.59	2.70	0.67	2.32	-
	774.2-70-G11/2-B	2.76	G 1 1/2	-	350	1.59	2.70	0.67	2.32	7.52
774.2-70-G2-A		2.76	G 2	-	350	2.01	2.70	0.67	2.32	-
	774.2-70-G2-B	2.76	G 2	-	350	2.01	2.70	0.67	2.32	7.52

d₁	d₂		Opening pressure in mbar	d₃	d₄	l₁	l₂	l₃

1.65	-	M 16 x 1.5	350	0.45	1.57	0.45	1.42	7.64
1.65	G 3/8	-	350	0.51	1.57	0.45	1.42	7.64
1.65	G 1/2	M 20 x 1.5	350	0.59	1.57	0.45	1.42	7.64
1.65	G 3/4	-	350	0.83	1.57	0.45	1.42	7.64
2.24	G 3/4	-	350	0.75	2.20	0.51	1.87	7.48
2.24	G 1	-	350	1.04	2.20	0.51	1.87	7.48
2.76	G 3/4	-	350	0.81	2.70	0.63	2.32	7.48
2.76	G 1	-	350	1.04	2.70	0.67	2.32	7.52
2.76	G 1 1/4	M 42 x 2	350	1.32	2.70	0.67	2.32	7.52
2.76	G 1 1/2	-	350	1.59	2.70	0.67	2.32	7.52
2.76	G 2	-	350	2.01	2.70	0.67	2.32	7.52

Min	Max	Price
1	6	US$32.88
7	99	US$31.69
100	249	US$29.90
≥ 250		US$26.91

Please select the country.

Select State

JW Winco Services

Our service team is available from Monday to Friday between 7:30 AM and 5:00 PM Central Time

1-800-877-8351 sales@jwwinco.com

Request Callback

JW Winco Services

Request Callback

JW Winco Handbook

Your Contact

JW Winco News

EN 774.2 Breather Valve Caps Plastic, with Filter, with Double Valve and Splash Guard

Product description

Specification

Accessory

Part Options / Table

Type

Metric

Build & Price

Functional Description

GN 109 Fluid Level Markings / Special Lengths (Special Order)

Selected Part

CAD Download

CAD data

Login

Email CAD File

Need Help?

This could also be interesting...

EN 775

EN 764

Your Contact

JW Winco Services


Breather valve caps EN 774.2 feature a double valve and are used for venting vessels, such as hydraulic tanks. The valve limits the overpressure inside the vessel by releasing air whenever the pressure value specified in the table is exceeded. Conversely, the valve allows air to enter into the vessel once an underpressure of -30 mbar is reached, preventing the formation of a vacuum. The respective flow rate depends on the pressure difference and can be read from the diagram. The integrated air filter prevents dust and dirt from entering the vessel. With fluctuating liquid levels, the overpressure reduces the air exchange, resulting in reduced filter contamination, especially in dusty environments. The pressurized air pocket above the liquid counteracts foam formation. The valve seal ensures that no liquid escapes, such as due to jerky movements or during transport.



For the series with dipstick shown above, a shortening and / or the attachment of level markings can be ordered with the service GN 109. The dipstick is shortened to the length l₁ and the marking notches are milled at l₂ or l₃, making them easily visible. The max. length l₁ is specified in the respective series. The length specifications l₁ to l₃ refer to the contact surface without seal, with a tolerance of ±1 mm to be taken into account. For critical applications, the seal must be taken into consideration with a thickness of up to 2 mm, depending on the series. If required, more than 2 notches may be inserted on request, which are then specified by appropriate details on the position (l₄ ... l_x). Furthermore, texts such as MAX / MIN may be laser-engraved in addition to or instead of the notches by submitting the appropriate template. The fluid level markings / special lengths GN 109 are to be ordered as a separate item in shopping cart step 1 under note.