There are three types of pressure reducing valve type classification as follows: Introduction to the type classification of action type pressure reducing valve. The simplest pressure reducing valve, direct acting pressure reducing valve, with flat diaphragm or bellows. Because it is a self-contained structure, there is no need to install external sensing lines downstream. It is the smallest and most economical of the three pressure reducing valves
, designed for low to medium flow rates. The accuracy of direct-acting regulators is typically +/- 10% of the downstream set point. Introduction to the classification of piston pressure reducing valve models. This type of pressure reducing valve integrates two types of valves - pilot valve and main valve. The design of the pilot valve is similar to that of a direct-acting pressure reducing valve. Exhaust pressure from the pilot valve acts on the piston, causing the piston to open the main valve. This design uses inlet pressure to open the main valve if it is too large to open directly. Therefore, this type of pressure reducing valve has higher capacity and accuracy (+/- 5%) than direct acting pressure reducing valves for the same pipe size. Like the direct acting pressure reducing valve, the pressure reducing valve senses the pressure internally and does not require an external sensing wire. Introduction to the classification of membrane type pressure reducing valves. In this type of pressure reducing valve, a double diaphragm replaces the piston in an internally piloted pressure reducing valve. This increased diaphragm area opens a larger main valve and has a larger capacity than an internally piloted piston regulator for the same pipe size. In addition, the diaphragm is more sensitive to pressure changes, with an accuracy of +/- 1%. The higher accuracy is due to the positioning of the downstream sensing line (outside of the valve) where there is less gas or liquid turbulence. This pressure reducing valve is very flexible and can be used with different types of pilot valves (eg pressure valve, temperature valve, air loading valve.
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