- ページ 6

コントロールユニット Dungs HPSV 10020/604のPDF 取付説明書をオンラインで閲覧またはダウンロードできます。Dungs HPSV 10020/604 8 ページ。 High pressure safety shutoff valve

Valve Leakage Test

This leak test procedure tests the valve seat sealing capabili-

ties of the safety shutoff valve. Only qualified personnel should

perform this test.

It is required that this test be done on the initial system startup,

and then repeated at least annually. Possibly more often de-

pending on the application, environmental parameters, and

the requirements of the authority having jurisdiction.

Setup

This test requires the following:

A) Test connection installed downstream of the safety shutoff

valve to make the required 1/4" hose connection in step 4.

B) A transparent glass of water filled at least 1 inch from the

bottom.

C) A proper leak test tube. An aluminum or copper 1/4" rigid

tube with a 45˚ cut at the end that is then connected to a

1/4" flexible hose of some convenient length provides for

a more accurate leakage measurement. However, a 45˚

cut at the end of the 1/4" flexible hose will suffice, but it will

not likely be as accurate as the rigid tube.

1/4" Flex Hose

1/4" Rigid Tube

Leak Test Procedure

Use the illustration below as a reference.

1. Close the downstream manual shutoff valve, or safety

shutoff valve.

2. Open the downstream test connection and connect the

1/4" flexible hose.

3. Provide for some time to allow potential leakage to charge

the test chamber before measuring valve seat leakage.

4. Immerse the 1/4 in. tube vertically 1/2 in. (12.7 mm) below

the water surface. If bubbles emerge from the 1/4" tube and

after the leakage rate has stabilized, count the number of

bubbles.

5. If the number of bubbles exceeds 6 within 10 s, replace

the valve.

After completing the above tests proceed as follows:

6. Verify that the downstream manual shutoff valve is closed.

7. Remove the flexible hose, and close the test connection.

6 ... 8