SAL Engineering & Technical Institute Chemical Engineering Department valves Prepared by: Pranay Patel(141260105036) Kuldip Maniya(141260105021) Jalak Patel(141260105029) Kiran patel(141260105031) Guided by: Prof. Jyoti verma

Types of Valves Gate valve Globe valve Check valve Definition of Valve : Any device for halting or controlling the flow of a liquid, gas, or other material through a passage, pipe, inlet, outlet, etc. A hinged lid or other movable part that closes or modifies the passage in such a device. Types of Valves Gate valve Globe valve Check valve

Four principles functions of valves:

Starting & Stopping -Gate Valves are the type best suited for this purpose. -When open gate Valves permit fluid to move in a straight line through the Valve with a minimum restriction of flow and loss of pressure.

Regulating or Throttling Flow Globe Valves. The Disc construction of a globe valve permits closer regulation. Throttling flow :A throttle is the mechanism by which fluid flow is managed by construction or obstruction.

Preventing Back Flow Check Valves perform the single function of preventing flow in one direction. Positive flow keeps these valves open, and reverse flow closes the check automatically.

Types of valves Globe Valves Gate Valves Plug valves Check valves Needle Valves Ball Valves Butterfly Valve

Globe valve A globe valve, different from ball valve, is a type of valve used for regulating flow in a pipeline consisting of a movable disk-type element and a stationary ring seat in a generally spherical body.

Flow path of valves The flow path is the space through which fire, heat. and smoke progress, moving from an inlet and the high-pressure fire area to where. the fire wants to go — toward lower pressure oxygen sources, outlet areas such as. door and window openings

Gate valve Solid Wedge Disc

Check valve Allows flow in one direction only. Automatic in operation.

Most control valves are globe valve Plug  Disc Composition  Disc Ball  Disc

Valve Limit Switches Provide remote indication of valve position We use mostly Namco Snaplok Limit Switches Environmentally qualified Generally 2 switches per valve Open switch – switch closed from the time the valve leaves open until about 95% open and powers the green light Closed Switch – switch closed from the time the valve is about 5% open until full open and powers the red light

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