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Ramsbottom Safety Cavle
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E22.9
MACHINE DRAWING
Ramsbottom Safety Valve
The Ramsbottom safety valve is a "spring loaded " type of safety valve. lt is usually employedin mobile boi lers such as locomotive and marine boi lers.
F ig.22. lsshowsaRamsbot tomsafetyvalve. l t isassembledfromthepar tsshowninFig.22. l4 .The body-Part No.1 is a U,shaped casting having two vertical branch pipes uniting at the bottomto form into a flanged opening. The top end ot eat h ot the branch pipes is screwed with a gun meta!valve seat -Part No.2. Two web type of gun r lrttol r,alves-Part No.1 0 are mounted over the valr eseats. 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 ValveF ig .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 leading dimensfons and printthe title -RAMSBOTTOM SAFETY VALVE and the
scale.
a spl i t pin -Part No.9, is mounted ovet r ' ,1'e of tht"valves. The other valve is held in posttrotr hv a pro-jected pivot extended from the lever. tsoth the valvesare held down on the valve seats against the steampressure by the pul lof the spring -Part No.13, the topend of which is hooked to the lever and the lower endis hooked to the shackle-Part No.3 which inturn isfitted to the main body using hexagonal nut -Part
No.6. Two ! inks-Part No.7 are also connected to thelever and the shackle using two pins -Part No.8 andtwo spl i t pins-Part No.9 so as to permit the l i f t of thevalves. These links prevent the lever and the valvesfrom being blown away in the event of spring failure.
Exercise 1
Details of a RAMSBOTTOM SAFETYVALVE areshown in Fig. 22.14. Draw the following views of theassembled valve to t:2.5 sca/e.
1 . Front view showing one half in section.
2. Top view.'
3. A side view in section.
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