Cameron Demco Руководство по установке, эксплуатации и техническому обслуживанию - Страница 10

Просмотреть онлайн или скачать pdf Руководство по установке, эксплуатации и техническому обслуживанию для Блок управления Cameron Demco. Cameron Demco 11 страниц. Resilient-seated butterfly valve

Печатать страницу

WORM GEAR OPERATED

Worm gear operators are recommended for valves larger than 6 inches. Clockwise rotation of the handwheel

closes the butterfly valve. Counterclockwise rotation opens the valve.

Gear operators are always mounted with the input shaft perpendicular to the pipe axis for handwheel clearance.

Each operator has an arrow on the top of the gear, which indicates the "OPEN - CLOSED" position of the valve

(Figure 13).

AUTOMATIC VALVES

Butterfly valves with their quarter turn operation are easily adapted to automatic actuators for remote operation.

To prevent water hammer, actuators should close the valve slower than 6 to 8 seconds, open-to-close. Rapid

closure causes water hammer which can break or otherwise damage valve parts.

MAINTANENCE PROCEDURES

TROUBLESHOOTING

Trouble

The valve will not seal

Foreign matter is present between seat

properly.

Operator stops are not set properly.

Build-up of solids or roughness on edge

The valve is hard to

operate.

TC-003001-01 / Rev 2

CLOSED

Figure 12 – Valve with Gear Operator

Table 6 - Troubleshooting

Probable Cause

The seat and/or disc is worn or

damaged.

and disc.

of disc.

Operator is not installed properly.

OPEN

CLOSED

Replace worn parts.*

Operate several times to wipe clean.

Adjust stops to proper setting.

Operate several times to wipe clean or disassemble valve

and clean disc edge.*

Reinstall operator in proper alignment with valve stem.

Remedy