WEBTEC 280 Serie Manual Del Usuario página 6

Ambient Temperature: -20 to 40 °C (-4 to 122 °F)
Fluid Type: Hydraulic Mineral Oil (or fluid designed to replace mineral oil)
Fluid temperature: 20 to 80 °C (68 to 176 °F)
External Parts:
Body, Cover, & Cap: Austenitic Chromium Nickel Stainless Steel 1.4404 (316)
Fasteners, Spindle, & Studs: Austenitic Chromium Nickel Stainless Steel UNS21800
NPTF & SAE Plugs: A4 316
BSPP Plug & Bonded Seal: UNS21800 & A4 316
Knob: Polymide based Technopolymer.
Socket Set Screw with Patch: A4 316 with Nylon 11 patch
Centre Action Spring: BS2056 316S42
Full working pressure internal parts:
Rotor: 708M40T (EN19T) Steel
Seats: 817M40T (EN24T) Steel
O' rings: FKM (Fluorocarbon Rubber)
B/U rings: NBR (Nitrile Rubber)
Other internal metallic parts: Various Carbon Steels
Maximum Weight: 3.2 kg (7 lbs)
The 280 Series valve conforms to the ATEX directive (BS EN13463-1:2009). It has been given
a rating of II 3G TX. This represents an equipment group II, category 3G, with a temperature
rating of TX.
Group II equipment has been designed for places with a potentially explosive atmosphere,
other than mines susceptible to firedamp.
Category 3G equipment has been designed to be capable of functioning in conformity with the
operational parameters established by the manufacturer and ensuring a normal level of protection.
Equipment in this category is intended for use in areas in which explosive atmospheres caused
by mixtures of air and gasses, vapours or mists or by air/dusts are unlikely to occur or, if they
do occur, are likely to do so only infrequently and for a short period only.
The temperature class marking of TX on the valve indicates that the actual maximum surface
temperature of the valve depends not on the equipment itself, but mainly on operating
conditions (heated fluid). The specification of the operating conditions are given above.
4
Specification
ATEX Statement