Symbols for Valves, Pumps and Electrical
Equipment on Ship
When you are making drawings or representing a particular valve of piece of
instrument, you cannot draw them every time. For making our life easy we have
symbols for representing them, just see it below.
Symbols for Valves
Pressure Reducing Valve
Applications: They are mostly used where we have a demand of reduced pressure. Like
for instance if
we want to reduce 30 bar pressure of air to 7 bar, then they come in use.
Safety Valve
Applications: As name suggest, wherever we want to secure our system (Generally the
pressurized one), we use them. Like boiler, compressors etc.
Self Closing Valve
Application: Generally they are used as drain valves. They are opened against the spring
tension, which puts them back to the normal position (Mostly closes), after extern force
is taken out. Example: Settling Tank drain valve etc.
Butter Fly Valve
Application: Places where we need quick closing and opening, we need this type of
device. Outlet valves form sewage tank, control air, or bypass valves.
Gate Valve
Screw Down Non Return Valve (SDNR)
Globe or Gate valves can be made Non return type. Non return types of valves find there
uses in place where we don’t want flow to come back like overboard valve, blow down
etc.
Duplex Oil Strainer
Applications: Duplex Oil Strainer has two messes, one fore the big particles and other
open for small.
They are mostly used for Lube oil and Heavy Oil filtration.
Sight Glass
Uses: Sight Glass is a transparent screen that used for looking in to the system, which is
normally used or the purpose is to detect traces of water or oil. Like Cascade tank or
settling tank overflow line.
Gauge Glass
This shows the level of liquid that is stored in the tank
Float Type Level Gauge
Diaphragm Operated Valve
Applications: These type of valve are generally used for load dependent flow like steam,
feed water etc.
Flow Meter
Eductor
Uses: They are generally used for creating vacuum and taking out brine in Fresh Water
Generator.
3 Way Cock
Uses: Generally used where we want to divert flow either way. Like changeover of
Duplex Filter etc. Position are L, T and opposite L.
Sounding Pipe With Cap
Electrical Instrument Symbols
So
So these were commonly used symbols for various types of valves and electrical
equipments onboard.
gate Valve is a term derived from Latin word Vulva, which is nothing but moving parts of the door. A door regulates entry at any place or system, like wise Vulva or Volvre regulates the flow of fluids and gases through parts of hydraulic or pneumatic system. Valves are part of the fitting family, A fitting with an improvised capability to regulate flow of Fluid or Gas becomes a Valve.
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