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Pressure Control Valves

UV-3.8 Overflow control valve - 20205 UV 3.8

Overflow valve for liquids and gasesup to 80 / 130 / 150 °C Technical Data

ConnectionG 1/2 - 2DN 15 - 50Nominal Pressure Inlet PressureK
setting screw vs -valuePN 10 - 16up to 2 - 16 bar in 3 setting ranges 3.5 - 5.5 m
3 /hTi g htnessSurface Rou g uideline 2174 ( leaka g e rate K 0.05 % of K
vs -value )
spring modulebody withvalve g hnessacc. VDI/VDE- K 3.2 µ m

Description

Medium-controlled overflow valves are simple control valves offe-ring accurate control while being easy to install and maintain. They control the pressure upstream of the valve without requiring pneu-matic or electrical control elements.The UV 3.8 overflow valve is a spring-loaded piston-controlled pro-portional control valve designed for hygienic applications and medi-um volumes. The valve cone is fitted with a hard seal.This bypass valve is manufactured from deep-drawn stainless steelfeaturing excellent corrosion resistance. It contains virtually nodead pockets and is suitable for use in CIP and SIP systems. Theangled design allows complete draining.The spring module comprising spring cover, spring, setting spindle,diaphragm and internal components, is connected to the valve body only by means of a clamp ring and two bolts. Changing the di-aphragm or the complete spring assembly for a different controlpressure range is extremely simple and does not call for specialtools. The same applies to servicing and maintenance. Changingthe control pressure setting does not affect the height of the valve (non-rising setting spindle).The inlet pressure to be controlled is balanced across the seat bythe force of the valve spring (set pressure). When the inlet pressurefalls below the pressure set using the setting spindle, the valvecone moves towards the seat and the volume of medium is redu-ced. When the inlet pressure rises the valve control orifice increa-ses; when the pipeline is depressurised the valve is closed. Rot-ating the setting spindle clockwise increases the inlet pressure.The UV 3.8 overflow valve does not require a pilot line. setting screw spring modulebody withvalve

STANDARD EQUIPMENT

•All stainless steel construction•Piston control

OPTIONS

•Polished version for food, pharmaceutical and superclean applications, surface roughness Ra K 0.25 or 0.4 or 0.8 µm•For toxic or hazardous media: sealed spring cover complete with leakage line connection (incl. sealed setting spindle). Must be installed with a leakage line capable of drainingleaking medium safely and without pressure•Various diaphragm and seal materials suitable for your medium •Special connections: Aseptic, ANSI or DIN flanges,welding spigots; other connections on request•Special versions on requestOperating instructions, Know How and Safety instructions must beobserved.We reserve the right to alter technical specifications without notice. K vs -values [m 3 /h] nom. pressureDNG251321 1/4401 1/2502K vs -value3.53.55.55.5 Setting Ranges [bar], Nominal Pressure 2 - 5PN 104 - 10PN 168 - 16PN 16 Sheet no. UV 3.8/2.1.041.1 - issue 26.04.2004 Pressure Tech 2000 Limited • Unit 6, Graphite Way, Hadfield, Glossop, Derbyshire SK13 1QG - GB • Tel. +44-1457-899307 • Fax +44-1457-899308