Samson 2408 Mounting And Operating Instructions

Contents

Samson 2408 Mounting And Operating Instructions Manual pdf 4 page image

1 Design and principle of opera-tionSee also Fig. 2, page 5.The process medium flows through the valvein the direction indicated by the arrow on thebody. The position of the valve plug (3) deter-mines the flow rate across the area releasedbetween the valve's plug and seat (2).In pressureless state (control line not con-nected or no pressure applied), the valve isclosed by the force of the set point springs (7).The upstream pressure p1 to be controlled istapped upstream of the regulator. Using anexternal control line, this pressure is transmit-ted to the tapped connection (9) on the actua-tor housing (6) where it is converted into a po-sitioning force by the diaphragm plate withoperating diaphragm (5). This positioningforce is used to move the plug stem (4) andthus the valve plug depending on the force ofthe set point springs (7). The spring force canbe adjusted on the set point adjuster (8).When the force resulting from the upstreampressure p1 exceeds the adjusted set point,the valve opens proportionally to the changein pressure.1.1 Process medium, applicationrange, versionsExcess pressure valve for set points between5 mbar to 1000 mbar for gases at tempera-tures from –20 to +60 °C.Valves with flanged body in DN 15 andDN 25 as well as with G ½, G ¾ and G 1 fe-male thread.2 InstallationSee also Fig. 2, page 5.NOTICEInstall a strainer (e.g. SAMSON Type 2 NI)upstream of the regulator (refer to sec-tion 2.2).Make sure the regulator is mounted free ofstress. If necessary, support the piping nearthe connecting flanges. Never attach supportsdirectly to the valve or actuator.2.1 Mounting positionMounting position (preferable)– Install the regulator in ahorizontal pipeline with theactuator housing and setpoint adjuster pointing ver-tically up,– The direction of flow must correspond tothe arrow on the body,– Install the control line with a downwardslope of approx. 10 % towards the tappingpoint to allow condensed liquid to flowback into the tank or pipeline.Other mounting positions– Install the regulator in avertical pipeline with theactuator housing and setpoint adjuster pointing tothe side.Note! Higher system deviations may occur inthis mounting position.– Make sure the direction of flow matches thearrow on the body (from bottom to top).4 EB 2528 ENDesign and principle of operation