CVS Controls 667 Gebrauchsanweisung

Blättern Sie online oder laden Sie pdf Gebrauchsanweisung für Controller CVS Controls 667 herunter. CVS Controls 667 8 Seiten. Diaphragm actuator

Seite drucken

Instruction Manual

CVS Type 667

Diaphragm

Actuator

Sizes 30-70

All CVS Controls actuators are to be installed and

maintained in accordance with instructions supplied

by CVS Controls.

This manual includes information on installing,

maintaining and adjusting the CVS Type 667

Actuator, sizes 30 to 70. Part numbers for the entire

assembly is also included. For information on other

equipment used with these actuators, consult the

appropriate manuals.

Introduction

The CVS 667 is a reverse-acting, spring-opposed

diaphragm actuators providing 3-inches (76 mm) of

maximum travel. Although typical pressure ranges

are 3 to 15 psi or 6 to 30 psi, additional pressure

ranges are available upon request. The CVS Type

667 Actuator is used for automatic operation of

control valves, effective in applications where

throttling or on/off service is required.

The actuator positions the valve plug in the valve in

direct response to the varying loading pressure on

the actuator diaphragm. When the signal pressure

increases to the lower diaphragm casing, the

actuator stem is forced upward, compressing the

spring. When the signal pressure is reduced, the

spring moves the actuator stem in the downward

direction. If the signal pressure should fail, the

spring will force the stem downward, providing "fail-

closed action" for "push down to close" valves.

Head Office

3900 – 101 Street

Edmonton, Alberta, Canada T6E 0A5

Office: (780) 437-3055

Fax: (780) 436-5461

Website: www.cvs-controls.com

Figure 1: CVS Type 667 Actuator

Specifications

Refer to Table 1 for specifications for the CVS Type

667 Actuator, and to the nameplate on your actuator

for settings specific to your equipment.

It is important not to exceed the Maximum

Diaphragm Pressure as listed in Table 1 when the

actuator is set at less than full travel. If this pressure

is exceeded before the travel stop comes in contact

with the upper diaphragm plate, the maximum

allowable valve stem load may be exceeded.

The Maximum Excess Diaphragm Pressure as listed

in Table 1 is the pressure that can be added when

the actuator is set at full travel. The sum of the

pressure which is required to fully stroke the valve

and the excess pressure added when the actuator is

against the stop must not exceed the "Maximum

Diaphragm Casing Pressure" as outlined in Table 1.

E-Mail: [email protected]

Calgary Sales Office

3516 – 114 Avenue SE

Calgary, Alberta, Canada T2Z 3V6

Office: (403) 250-1416

Fax: (403) 291-9487