GATE GLOBE CHECK VALVES CATALOGUE, LIST OF ALL JC VALVES, TECHNICAL FEATURES

Gate Valve
Gate valves serve as efficient on-off valves with flow in either direction. In such a design, a wedge slides cross a general passageway in order to control fluid flow (like a  sliding  gate  -  hence,  the  name).  One  of  the  most significant  characteristics  of  this  type  of  valves  is  its straight-through, unobstructed passageway when set in the “full open” position. This is made possible by the wedge lifting entirely out of the passageway. As a result, gate valves are characterized by a minimum of turbulence and pressure drop in operation.

GLOBE  VALVE
All  globe  valves  utilize  the  “port  closure”  concept  of valves.  By  this  it  meant  that  fluid  passes  through  a specific opening (rather than a general passageway, as in the case of gate valves), and the fluid is controlled by means of a stem-mounted disc or inserted plug in that area.
Despite of lacking the straight through, unobstructed passageway of the gate valve, these globe types are superior in two key aspects - throttling and service- ability  under  frequent  use.  They  are  better  at  the throttling  function  because  they  permit  fluid  to  exit uniformly around the circumference of a seat, rather than “slicing” down to limit passage through a nar- rowly restricted area.

Check Valves
While not a valve in the traditional sense, check valves serve  an  important  application—namely  to  prevent flow in one direction while allowing it in the other. A check valve is self-actuated and designed to prevent fluid  from  flowing  back  into  the  system  (prevent reverse flow). Real-life applications include preventing backflow  into  an  injection  line  or  into  a  pump.  The fluid flow opens the valve by forcing a disk or ball in one direction. When the flow stops, the disk or ball is seated and closes the valve. They can be installed in horizontal or vertical upward flow piping.

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