T 2520 EN Type 2405 Pressure Reducing Valve Self-operated Pressure Regulators Application Pressure reducing valve for set points from 5 mbar to 10 bar Nominal size DN 15 to 50 · Nominal pressure PN 16 to 40 Suitable for gases at temperatures from –20 to +60 °C (0 to +150 °C) 1) This regulator is used to control the pressure of flammable gases used as a source of energy, e.g. in boilers, driers, vaporizers, heat exchangers or industrial ovens. Alternatively, it can control the compressed air supply in process engineering applications. An additional application of the regulator is the pressure control of inert gas used for inerting or blanketing reaction or storage tanks to protect the product in the tank from oxidation, explosion or escaping. To achieve an economical consumption of the inert gas, its pressure must be controlled to always remain slightly higher than atmospheric pressure while the tank is being filled or emptied. Special features •• Low-maintenance proportional regulators •• Compact regulator design providing excellent control accuracy •• Internal set point springs with set point adjustment using a nut on the actuator •• Spring-loaded, single-seated valve balanced by a balancing diaphragm •• External connection of a control line •• Meets strict emission requirements •• Minimum leakage class IV •• Suitable for use as a vacuum breaker Version Valve DN 15 to 50 · Flanged connections · Soft-seated plug Body made of cast iron EN-GJL-250, spheroidal graphite iron EN-GJS-400-18-LT, cast steel 1.0619, stainless cast steel 1.4408 or stainless forged steel 1.4571 Fig. 1: Type 2405 Pressure Reducing Valve Special versions •• Version with FDA-compliant materials for food processing and pharmaceutical industries •• NACE version for sour gas applications •• Version with force limiter (for higher pressures across the operating diaphragm) •• Actuator with seal and leakage line connection (also as vacuum breaker) •• Version with connected control line. Pressure tapped directly at the valve body For unbalanced versions with FKM diaphragm or FKM soft seal SAMSON AKTIENGESELLSCHAFT · Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany Phone: +49 69 4009-0 · Fax: +49

Principle of operation The medium flows through the valve in the direction indicated by the arrow. The position of the plug determines the flow rate across the area released between plug (3) and seat (2). In the pressureless state (control line not connected and no pressure applied) the valve is opened by the force of the set point spring (7). The downstream pressure p2 to be controlled is tapped downstream of the valve and transmitted over the control line to the actuator where it is converted into a positioning force. This force is used to move the valve plug according to the force of the set...

Table 1: Technical data

The regulator is preferably to be installed in horizontal pipelines –– Actuator housing on top, actuator facing upwards –– Direction of flow must match the direction indicated by the arrow on the body –– In applications in which the blanketing gas can liquefy, condensate may form in the control line, causing damage to the regulator. To allow condensate to run back into the tank, install the control line with an approximate 10 % slope to the pressure tapping point at the tank. –– Distance between the pressure tapping point and regulator min. 6 x DN In exceptional cases, the regulator can also...

Table 3:  Dimensions in mm and weights in kg Nominal size Other materials Height H Without balancing With balancing Without balancing With balancing Without balancing With balancing Without balancing With balancing Without balancing With balancing Without balancing With balancing Without balancing With balancing Without balancing With balancing Without balancing With balancing

Ordering text Type 2405 Pressure Reducing Valve Nominal size DN ..., set point range … mbar (bar), KVS …, Body material …, optionally, special version ... Materials: plug sealing ..., balancing diaphragm ..., Specifications subject to change without notice operating diaphra