Breather Check Valve Caps EN 774.1

LESA original design
code: TVD.

Color: RT - Red, RAL 3000

Product description

Breather check valve caps EN 774.1 prevent the build up of underpressure in fluid containers.

They are used when a container is to be emptied quickly. The elastic membrane ensures a sufficient air supply.

Besides that, the contact pressure of the membrane prevents the escape of fluid, e.g. during transport. If the container is turned upside down, the additional contact pressure from the fluid will be sufficient to keep the outlet firmly shut.

Specification

Upper part (cap)
Plastic
Technopolymer (Polypropylene PP)
- Temperature resistant up to 122 °F (50 °C)
- Red, RAL 3000RT
  Membrane and flat seal
  EPDM (Ethylene propylene diene rubber)
- Green, RAL 6001GN
  Membrane and flat seal
  FKM (Fluor rubber, Viton^®)
- Black printed symbol

Lower part (screw-in thread)
Plastic
Technopolymer (Polypropylene PP)
- Temperature resistant up to 122 °F (50 °C)
- Black

RoHS

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Part Number RT	Part Number GN	d₁	d₂ Pipe thread	d₃	d₄	l₁	l₂	Air flow rate in l/min Underpressure in mbar	Seal membrane FKM	EPDM


125GFG9R	125GFG9G	2.76	G 1 1/4	1.30	2.70	0.67	2.32	50	40	30	20	10	5	360	320	260	210	140	110	370	330	280	230	160	130

d₁	d₂ Pipe thread	d₃	d₄	l₁	l₂	Air flow rate in l/min Underpressure in mbar	Seal membrane FKM	EPDM

2.76	G 1 1/4	1.30	2.70	0.67	2.32	50	360	370
2.76	G 1 1/4	1.30	2.70	0.67	2.32	40	320	330
2.76	G 1 1/4	1.30	2.70	0.67	2.32	30	260	280
2.76	G 1 1/4	1.30	2.70	0.67	2.32	20	210	230
2.76	G 1 1/4	1.30	2.70	0.67	2.32	10	140	160
2.76	G 1 1/4	1.30	2.70	0.67	2.32	5	110	130