Technical Specifications - Watts MS Serie Manual De Instalación Y Funcionamiento

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RELIEF VALVES

Technical Specifications

Connection: threaded UNI EN 10226-1

Maximum inlet pressure: 2 bar

Ambient temperature: -10÷60°C

Response pressure: red spring 30÷130 mbar

blue spring 80÷600 mbar

Fuel: all three families of gas (city gas, methane, LPG);

non-aggressive gases.

Material: aluminium valve's body and cover; stainless

steel springs; steel control piston; NBR rubber gasket and

O-ring; other parts made of brass, aluminium and gal-

vanised steel.

General information

The relief valves in the MS Series are normally closed.

The valves open solely is the inlet pressure is greater than

the calibration value. The valves close automatically when

the pressure returns to below the calibration value.

Installation

The relief valves in the MS Series conform to Directive

2014/34/EU (ATEX) in group II category 2G and in group

II category 2D; as such they are suitable for installation in

zones 1 and 21 and, even more so, in zones 2 and 22 as

classified in enclosure I of Directive 99/92/EC.

The relief valves described here are not suitable for use in

zones 0 and 20 as defined in Directive 99/92/EC.

To determine the qualification and extension of the hazard-

ous zones, see standard EN 60079-10.

If installed and maintained as per the conditions and

instructions given in the enclosed technical manual, the

relief valve is not a source of specific danger.

In particular, under normal operating conditions, the device

only rarely emits inflammable substances such as to gener-

ate an explosive atmosphere.

The relief valve has a work membrane and a safety mem-

brane; if the work membrane breaks, the safety membrane

guarantees gas emission with flow rate no higher than 30

/h. A continuous explosive atmosphere able to gener-

ate a hazardous zone 0 is emitted solely in the event both

membranes break simultaneously.

In the event the valve is installed in an unmanned or poorly

aired location, all the necessary precautions should be

taken to prevent the valve from being the cause of a zone 0.

For example, the breather may be routed outside via a

copper pipe connected to the threaded hole G1/8" by

removing the dustproof brass cap.

The descriptions and photographs contained in this product specification sheet are supplied by way of information only and are not binding. Watts Industries reserves the right to

carry out any technical and design improvements to its products without prior notice. Warranty: All sales and contracts for sale are expressly conditioned on the buyer's assent

to Watts terms and conditions found on its website at www.wattswater.eu. Watts hereby objects to any term, different from or additional to Watts terms, contained in any buyer

communication in any form, unless agreed to in a writing signed by an officer of Watts.

MB-MOI-IT-W-ML-10-20-Rev1

The valve may be assembled in a variety of positions; on

horizontal piping it is advisable to keep the valve sleeve fac-

ing upwards.

The following guidelines should be followed:

• do not lever on the sleeve when assembling the valve;

• ensure that the piping is well aligned and that there are no

obstructions or dirt inside;

• observe the flow direction as shown by the arrow printed

on the valve body;

• check that all pressure, temperature etc. parameters are