B-FLAP explosion isolation valve

Producer: RSBP

The B-FLAP passive explosion isolation flap valve is a reliable safety device designed to prevent the propagation of flames and shock waves into adjacent areas of process equipment. This explosion isolation flap valve acts as a mechanical check valve and is used wherever combustible dust is present – in filtration separators, cyclones, dryers, mills, aspiration systems, and similar industrial plants.

The B-FLAP explosion isolation valve is manufactured in compliance with the European Parliament and Council Directive 2014/34/EC and standards EN 16447, EN 15089, and EN ISO 80079-36. Classified as explosion-proof equipment, it belongs to equipment group II and can be applied in zones 20 and 2 (inside B-FLAP I) as well as zones 21 and 1 (outside the unit).

Note: The isolation flap valve is not intended for use in explosive gas or hybrid environments.

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Description
Technical features
Documentation
Installation & Maintenance

Description

During normal operation, the non-return damper blade of the explosion isolation flap is either kept open by the airflow energy or secured by the RPD locking mechanism. The second option offers higher operational safety, ensuring the device remains open without causing unwanted pressure losses in the duct system.

In the event of an explosion, the air shock wave forces the explosion isolation valve to close and lock in the shut position. This passive mechanical action effectively stops the spread of flames and pressure waves through pipelines, providing reliable industrial explosion protection.

Advantages

Suitable for pipes from DN 100 to DN 800.
Mechanical principle of operation. Does not depend on power supply.
Does not require complex maintenance. It is sufficient to keep the valve free from dirt.
Can be operated in ambient temperatures from -40°C to 80°C (-20°C to 60°C for versions with electrical components).
Operation is independent of the concentration of combustible dust in the pipeline, provided that maintenance intervals are observed.

Technical features

Passive explosion isolation valve B-FLAP is made of structural steel. Stainless steel on request. Coating is Komaxit (RAL 3000 – red). Can be painted in any other colour on request.

Available in various dimensions:

Size	ØA (мм)	ØB (мм)	ØC (мм)	D x ØE	L (мм)	N (мм)	P (мм)	Weight (kg)	Explosion hazard classes	Distance for installation min. – max. (m)	Устойчивость к давлению p макс. (bar) Pressure resistance p max. (bar)
DN100	152	132	100	4 x 9,5	280	287	244	9	St1, St2	3 – 7	1
DN125	177	157	125	4 x 9,5	305	308	269	11	St1, St2	3 – 7	1
DN150	202	182	150	6 x 9,5	330	337	294	13	St1, St2	3 – 7	1
DN200	253	233	200	6 x 9,5	390	387	344	18	St1, St2	3 – 7	1
DN250	303	283	250	6 x 9,5	510	502	417	40	St1, St2	4 – 7	0,65
DN280	343	317	280	8 x 9,5	560	537	447	47	St1, St2	4 – 7	0,65
DN300	363	337	300	8 x 9,5	580	552	467	50	St1, St2	4 – 7	0.65
DN315	378	352	315	8 x 9,5	600	567	482	53	St1, St2	4 – 7	0.65
DN355	418	392	355	8 x 9,5	630	607	522	61	St1, St2	4 – 7	0.65
DN400	464	438	400	8 x 9,5	695	652	568	77	St1, St2	4 – 7	0.65
DN450	514	488	450	8 x 9,5	750	702	619	88	St1	4 – 7	0.8
DN500	564	538	500	8 x 9,5	800	752	669	101	St1	4 – 7	0.8
DN560	664	629	560	16 x 14	930	838	745	157	St1	4 – 7	0,8
DN630	734	698	630	16 x 14	1005	908	815	180	St1	4 – 7	0,8
DN710	814	775	710	16 x 14	1156	1103	962	305	St1	3 – 7	0,7
DN800	904	861	800	24 x 14	1246	1193	1052	351	St1	3 – 7	0,7

The B-FLAP non-return valve can be optionally equipped:

Terminal box for connection of electrical components.
Intrinsically safe relay. Required if sensors are connected.
Optional counter flange to be welded to the pipework.
Special flange seals in customer-specified material.
Damper position sensor. This provides a signal to close the valve for use in plant automation.
Fouling sensor. Reports the accumulation of a significant layer of product in the valve body for timely maintenance.

Documentation

B-FLAP I datasheet

En

B-FLAP I designsheet

En

DUST SENSOR datasheet

En

Installation

The following rules must be observed when selecting and installing the passive isolation flap valve:

The combustible dust explosion class must comply with B-FLAP;
Observe the minimum and maximum installation distances, tilt angle and installation space as specified in the operating instructions;
Valve size must correspond to the pipe diameter or adapters with an angle of inclination α ≤ 16° must be used;
Explosion-proof valve may only be exposed to an explosion wave propagation in one direction.

If isolation flap valve cannot be installed horizontally, it can be installed with a certain inclination α ≤ 90°. Note that the intended direction of detonation must always be horizontal or downward.

Important. B-FLAP must be mounted and operated so that no electrostatic charge can arise on its outer jacket. For example, it is not recommended to clean the explosion-proof valve with a dry cloth.

The scope of delivery includes:

Assembly and operating instructions;
Work log;
Delivery notification;
EC Declaration of Conformity 2014/34/EU.

Maintenance

The operator must assign a person to be responsible for the safe operation and correct condition of the explosion-proof valve. This must be a qualified person who has undergone appropriate training and has no health-related contraindications.

The maintenance intervals should be determined by the operator on the basis of the manufacturer’s instructions and the operating conditions. Recommended intervals:

1st maintenance interval — 1 week after commissioning;
2nd maintenance interval — one month after commissioning;
3rd service interval — after 3 months after commissioning;

The shortest maintenance interval is once a year. The valve is inspected for clogging by material carried in the pipeline, as this may impair the function of the unit. If necessary, mechanical cleaning is carried out.

A maintenance schedule is to be drawn up to ensure that the explosion-proof valve is always in perfect condition.

All maintenance work must be recorded in a work log. It is included in the scope of supply.

Advantages of working with ATEX.CENTER

The customer will have no problems with the supply of components and service. ATEX.CENTER is an official distributor of the leading European distributor of explosion protection equipment RSBP spol. s r.o. Our specialists periodically confirm their qualification in his commission of expertise.