Reducing valve for steam Yoshitake GP-1000SS

Клапан з «пілотним» керуванням плунжерного типу для універсального застосування.  Висока надійність із тривалим досвідом застосування.

1. Підвищена стійкість до корозії, якщо проточні частини виготовлені з нержавіючої сталі (GP-1000SS) або всі деталі виготовлені з нержавіючої сталі (GP-1000AS).
2. Сферичний головний клапан забезпечує хорошу герметичність та зменшення витоків із сідла клапана (відповідає класу IV за стандартом ANSI).
3. Відповідає стандарту Товариства інженерів з опалення, кондиціювання повітря та санітарної техніки в Японії SHASE-S106 з редукційних клапанів.

Sizing Chart (Steam)

Example 1

When selecting the pressure reducing valve nominal size at inlet pressure (P1), reduced pressure (P2) and steam flow rate of 0.6 MPa, 0.4 MPa and 800 kg/h respectively, first find the point of intersection (a) of the lines inlet pressure 0.6 MPa and reduced pressure 0.4 MPa. From this point, draw a line down to the intersection with the line corresponding to the flow rate of 800 kg / h — intersection point (B). Since the point of intersection (B) lies between the nominal dimensions 40A and 50A. select a larger — 50A.

Example 2

When selecting the pressure reducing valve nominal size at inlet pressure (P1), reduced pressure (P2) and steam flow rate of 0.8 MPa, 0.05 MPa and 600 kg/h respectively, first find the intersection point (C) of the lines inlet pressure 0.8 MPa and diagonal. From this point, draw a line to the left until it intersects with the line(s) corresponding to a reduced pressure of 0.05 MPa. From this point(s), draw a line downward until it intersects with the line corresponding to a flow rate of 600 kg/h — intersection point (E). Since the point of intersection (E) lies between sizes 32A and 40A, choose a larger — 40A.

* The safety factor should be taken equal to 80-90%.

Diagram of the selection of technical characteristics

Find the point where the inlet and negative pressures intersect. If the intersection point is within any of the ranges shown in the graph above, the pressure can be controlled.

Range (A) and (C): GP-1000 Series except GP-1002 and 1012

Range (B) and (C): GP-1002 and 1012

Flow curve

Pneumatic load pressure setting chart

The dependence of the set pressure on the pressure of the pneumatic load is generally shown on the left. The value of the set pressure may vary slightly depending on the operating conditions. For actual use, adjust the pneumatic load pressure according to the desired set pressure value.

Adjusted Coefficient Su

Example

Select a pressure reducing valve with an inlet pressure of 0.8 MPa and a reduced pressure of 0.05 MPa.

On the graph, find the point of intersection (A) of the input value with the output pressure graph and draw a horizontal line from it until it intersects with the vertical axis. The correction factor will be equal to 0.85. For nominal size 25A, the correct value of Cy is calculated as follows: 4 (nominal value of Cy) • 0.85 (correction factor) = 3.4

 Pressure curve

This graph shows the reduced pressure as the valve inlet pressure changes from 0.3 MPa to 1 MPa at a set pressure of 0.1 MPa.

• Preset pressure relief valve for emergency use on the outlet side of the steam pressure reducing valve

If a relief valve is installed at the steam outlet of the relief valve for emergency use and no laws or regulations apply, the capacity of the relief valve should be approximately 10% of the pressure relief valve's maximum flow.

GP-1000 consumption table

* When the inlet pressure exceeds 0.7MPa and the pressure reduction ratio exceeds 10:1, calculate the corrected value Cy. multiplying the nominal value Su by the correction factor C according to fig. 1.