Line rupture safety valves type LB - HAWE Hydraulik - #1

Text version of the page

Check valves Line rupture safety valves type LB The line rupture safety valves type LB are check valves. They are available as screw-in valves or with housing for in-line installation. The line rupture safety valves are best installed directly on the actuator (cylinder) which is to be safeguarded. This will prevent an uncontrollable, accelerated movement (drop) of a loaded cylinder, when the hydraulic back-pressure is lost as a result of a rupture of the pressurized line or pipe connection. When the flow through the valve increases above the pre-set limit, the flow forces will exceed the opposing spring force and the valve will block the flow immediately. The valve element in these valves is a shim. There are two different versions available. One valve design completely blocks the flow when actuated, whereas the other one allows a minimum flow (via an orifice) to slowly drop the load. Nomenclature: Design: Adjustability: pmax: Qmax: Line rupture safety valve Valve insert with housing for in-line installation Tool adjustable 700 bar 4 ... 160 lpm 2.5-18 2009 2 5 Simplified Detailed Order examples LB 4 C - 40 Line rupture safety valve size 4 as screw-in valve (coding C), factory set for a response flow of 40 lpm LB 2 G - 25 Line rupture safety valve size 2 with housing (coding G), factory set for a response flow of 25 lpm Standard with add. bypass Basic types and general parameters Flow Qmax (lpm) 4 ... 25 4 ... 25 6.3 ... 50 6.3 ... 45 16 ... 80 25 ... 160 Pressure pmax (bar) 500 700 500 700 500 500 Connection thread (BSPP) G 1/4 (A) G 1/4 (A) G 3/8 (A) G 3/8 (A) G 1/2 (A) G 3/4 (A) Basic type and size LB 1 LB 11 1) LB 2 LB 21 1) LB 3 LB 4 Symbol Available orifice diameters 0.5 / 0.8 / 1.0 / 1.2 / 1.5 / 2.0 depending on type and size Additional versions • Line rupture safety valve with housing featuring a thread reduction for special applications • Versions with metric and UNF thread 1) The mounting thread is sealed additionally