Different types of valve in ship and it's uses;
GLOBE VALVE
There 2types of Globe valve used;
1) RETURN TYPE GLOBE VALVE
a)straight through and angle globe valve.

  USES-
# Mainly used in LO and FO filling,transfer and purifying system (eg Suction side of  fuel oil transfer pump, suction side of purifier supply pump, filling and suction valve of HFO bunker tank) .
#In the boiler feed water system.
#control air system
#steam service system(no non return valve here)
#compressed air service system

2)NON RETURN TYPE GLOBE VALVE
a) straight through and angle non return valve

- It's uses are very less eg before the 3way valve of the purifier inlet.
b) screw down non return valve(SNDR)-

USES -
#discharge side of HFO transfer pump and purifier supply pump.
#boiler feed water check valve.
# fire and bilge pump discharge valve
#suction valve of bilge well
#suction and discharge valve of bilge transfer pump and bilge seperator pump.
#emergency bilge suction
# discharge of air compressor and air bottle
# steam condensate system all drain
#F.W service system.
#ME LO pump dischage valve


BUTTERFLY VALVE
There are various type of butterfly valve they are;
a)wafer lever type
b)lug lever type

c)wafer gearbox type.
d)lug gearbox type

USES OF 
wafer and lug type butterfly valve are used in
#In all sea water pipeline valve. Cooling sea water pump suction and discharge valve.
# suction valve for fire and bilge pump from bilges and cargo hold bilges.
#In LOW temperature cooling water system . LT WATER inlet and outlet to air cooler,LO cooler etc
#HT cooling system. In HT cooler both inlet and outlet valve for LT and jacket water.
#No butterfly valve is used in FO and LO system.
#FWG suction and discharge valve.

e)butterfly check valve.
Butterfly check valve are basically non return valve used in;

#Cooling sea water pump discharge has both lug gear type butterfly valve and butterfly check valve.
#same as for FWG ejector pump discharge has both lug gear type and butterfly check valve.


GATE VALVE

THE GATE VALVE USES IS VERY LESS you can find it in few places like furnace drain valve in boiler.

SAFETY VALVE

There are basically 3types of globe or straight through type safety valve
1)ordinary safety valve
2)high lift safety valve
3) improved high lift safety valve

USES
# IN every  PLATE TYPE HEAT EXCHANGER of Lube oil and Fuel oil.
#AIR BOTTLE
#BOILER
# After the FO supply pump in FO service system of main engine.etc

RELIEF VALVE

The relief valve can be straight through and angle type.

USES
#SCAVENGE AIR RECIEVER
#In all GEAR TYPE OF PUMP(ex FO supply , FO circulating, FO transfer pump etc)
#After every stage of air compressor
#In cylinder cover
# In discharge side of refrigerant compressor and also fitted in the condenser


QUICK CLOSING VALVE

USES
# Suction of HFO service and settling tank to purifier.
#Suction of bunker tank to settling tank
#suction of waste oil service tank to incinerator.
#Suction of generator engine LO settling and service tank
#suction of main engine LO settling and LO service tank.
#Suction of CYLINDER OIL storage tank.

The various valve symbol