Pressure reducing

valveByDr. Ahmed Mostafa

Assist. Prof. of anesthesia & I.C.U.

• Are used to regulate the gas pressure and are

not appropriate for measuring flow rates.

• The high pressure inside gas cylinders is

reduced by a pressure regulator before

connection to equipment such as an anesthetic

machine.

Function

1- Easy adjustment of gas flow rates.

2- Allow steady flow rates.

3- Prevents equipment damage.

Types1- Single stage valve:

Suitable for anesthesia machines and O2 therapy equipments.

2- two stage valve:- A two reducing valves arranged in serious.- Suitable for laboratory instruments, some

anesthesia machines and pneumatic ventilators.

Single-stage pressure regulator Double-stage pressure regulator

Types3- Demand valve:- Supply the gas to the patient during inspiration

only.- It is suitable for Entonox cylinders and

breathing apparatuses for firemen.

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Thank you

Dr. Ahmed Mostafa