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E 22.9 MACHINE DRAWING Ramsbottom Safety Valve The Ramsbottom safety valve is a "spring loaded " typeof safety valve.lt is usually employed in mobile boilers such as locomotive and marine boilers. Fig.22.lsshowsaRamsbottomsafetyvalve. ltisassembledfromthepartsshowninFig.22.l4. The body-Part No.1 is a U,shaped casting having two vertical branchpipesuniting at the bottom to form into a flanged opening. The top end ot eath ot the branch pipes is screwed with a gun meta! valve seat -Part No.2.Two web type of gun rlrttol r,alves-Part No.1 0 are mounted over the valre seats. A pivot ---'Part No.1 2 pivoted to the err ! of tire,le,Ve.r-,-Part No.1 :l using a pin-Part No.8 anl Ramsbottom Safety Valve Fig.22.13 Exercise 2 The parts of a RAMSBOTTOM SAFETY VALVE are shown in Fig. 22.t 4. Draw to 1 :2.5 scale, the following views of the valve in full open position. l.,Front view in section. 2. Top view. . 3. Right view in section. Insert the leadingdimensfons and printthe title -RAMSBOTTOM SAFETY VALVE and the scale. a split pin -Part No.9, is mounted ovet r',1'e of tht" valves. The other valve is held in posttrotr hv a pro- jectedpivot extended from the lever. tsoth the valves are held down on the valve seats against the steam pressure by the pullof the spring -Part No.13, thetop end of which is hooked to the lever andthe lowerend is hooked to the shackle-PartNo.3 which inturn is fitted to the main body using hexagonal nut -Part No.6.Two !inks-Part No.7 arealso connected to the lever and the shackle using two pins -Part No.8 and two splitpins-Part No.9 so asto permit the lift of the valves. Theselinks prevent the lever and the valves from being blown away in the eventof spring failure. Exercise 1 Details of a RAMSBOTTOM SAFETYVALVE are shown in Fig. 22.14. Draw the following viewsof the assembled valve to t:2.5 sca/e. 1 . Frontview showing one half in section. 2. Topview.' 3. A sideview in section.
