The difference and relationship between nominal pressure, test pressure and working pressure

1. Nominal pressure

(1) Nominal pressure - the compressive strength of the product at the reference temperature, expressed in PN, unit: MPa

(2) Reference temperature: Different materials have different reference temperatures. For example, the reference temperature of steel is 250°C

(3) Nominal pressure 1.0Mpa, recorded as: PN 1.0Mpa

E.g. 10'' BW 900LB check valve nominal pressure is 900LB

2. Test pressure

(1) The pressure for the strength test of the product, expressed in Ps.

(2) The test pressure is 4.0Mpa, denoted as: Ps 4.0Mpa.

3. Working pressure

(1) The pressure that pipes and fittings are subjected to under normal conditions, expressed in Pt.

(2) t × 10 = maximum working temperature of the product.

(3) The maximum temperature of the medium is 300°C, and the working pressure is 10Mpa, denoted as: P 30 10Mpa.

4. The relationship between test pressure, nominal pressure and working pressure:

    Ps > PN > Pt

  The nominal pressure of the valve refers to the design working pressure of the valve, and the pressure level is divided according to the standard.

  The working pressure of the valve is the actual pressure of the user in the application environment, which should be less than the nominal pressure of the valve.