EN 775 Safety Breather Valve Caps Plastic, with Double Valve


EN 775 Plastic Safety Breather Valve Caps, with Double Valve
ELESA original design
code: SFW / VP.

Product description


For function and operational criteria of safety breather valve caps EN 775 with double valve, see description of function.

In addition, they are characterized by the following properties:

A torque limiter is installed in the mechanism which is set to give the optimum screw-in torque to ensure a perfect seal. Once the breather valve caps are screwed in position, they can only be removed with a special key. This vandal-proof function ensures that the breather valve caps cannot be opened or removed by an unauthorized person.

Furthermore, the connection between upper part (cap) and lower part (screw-in thread) conforms to IP protection class 65.

These safety breather valve caps are supplied with two keys each.



  • Temperature resistant up to 212 °F (100 °C)
  • Black
  • Upper part (cap)
    Polyamide PA
  • Lower part (screw-in thread)
    Polyacetal POM

Rubber NBR (Perbunan®)

Air filter
PU foam (Polyurethane)
Grade of filtration 40 µm

Plastic, red

Insert profile
Stainless steel sheet metal

Thrust spring
Stainless steel


Technical drawing

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EN 775 Plastic Safety Breather Valve Caps, with Double Valve sketch

Part Options / Table

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Dimensions in: Inch (change to Metric)
Opening pressure in mbar
at container overpressure
Opening pressure in mbar
at container underpressure
G 3/4-350700*301.420.630.590.222.68
-M 42 x 2350700*301.851.260.830.162.91
* Not available from stock, requires a minimum order quantity

Build & Price

3D Product Configurator
Pipe thread d1
Fine thread d1
Opening pressure (container overpressure)

Description of Function

Skizze Funktion GN 775

EN 775 safety breather valve caps with double valve are normally used when the fluid container is under pressure, yet air has to flow in from the outside in case of underpressure (decreasing fluid level).

This is achieved by combining two valves (check / bypass valve). The inlet valve allows air to enter at an underpressure of 30 mbar or higher. The second valve only opens at an overpressure of > 350 / 700 mbar.

The air filter prevents contamination of the fluid from outside (dust). It is made of PU foam with a grade of filtration of 40 µm.

The overpressure inside the container ensures that the air volume, which is flowing in or escaping due to the fluctuating fluid level, is kept to a minimum. This reduces filter fouling and substantially increases the service life, especially in dusty environments.

In addition, a pressurized container has a positive effect on the function of the pump and prevents the formation of foam.

The valve seal ensures that no fluid will leak, especially if the fluid is strongly moved or during transport.

Sketch GN 775 pressure

Pressure gradient Δp [mbar] in the container as a function of the air flow rate [l/min] at a valve opening pressure of 350 or 700 mbar.

Assembly Instruction

Sketch GN 775 assembly

When screwing in, a torque limiter ensures that a specified torque is not exceeded. It is set for optimum seal. Turning out the cap without a key is no longer possible.

When screwing in, the key must not be inserted.

To unscrew, turn the cap clockwise to the stop (torque limiter). In this position, insert the key into the keyhole. This will connect the screw-in thread and the cap, allowing the breather valve cap to be removed.The key is designed such that, when inserted, it can be clipped to the cap.

Selected Part

Total US Dollars (net)
Call / Email for Delivery Time
Please note our quantity discounts (US Dollars).
≥ 250$84.92
Prop 65: -
Please contact our Sales Department for more information.
RoHS: -
No details on RoHS compatibility are available at this time. Please contact our Sales Department for more information.
Weight: 0.308 lbs
If weight is not listed, please contact our Sales Department for additional information regarding weight.
Phone: 800-877-8351
All Prices are in US Dollars. Taxes Not Included.

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EN 775-G3/4-350EN 775-G3/4-700EN 775-M42x2-350EN 775-M42x2-700

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