Adjustable pneumatic three piece welded ball valve

TQ661F Adjustable Pneumatic Three piece Welded Ball Valve

TQ661F adopts a three piece valve body, welded connection, and pneumatic actuator. The page is marked as adjustable type with locator configuration. The diameter is DN15-DN100 and the pressure is marked as 1000WOG/2000WOG.

Having a locator does not mean fixed high-precision adjustment

A positioner changes actuator position in response to the control signal. Valve flow characteristics, control accuracy and rangeability also depend on the ball opening, seat, differential pressure and operating conditions.

How to understand 1000WOG and 2000WOG?

The pressure marking identifies the selected rating. Allowable operating pressure depends on the valve materials, temperature, sealing structure and applicable standard.

How to choose a locator and accessories?

The input signal, locator type, gas source conditions, and valve position feedback should be confirmed based on the control system. HART、 Bluetooth, self diagnosis, explosion-proof rating, and other communication functions can only be declared when the corresponding locator actually has them.

See other pneumatic control ball valvesSelection of Pneumatic Ball Valve。

Frequently Asked Questions

Can the control accuracy of ± 1% be achieved after configuring the locator?

This cannot be guaranteed as the overall control performance depends on the valve, actuator, positioner, operating conditions, and control system.

Is HART the default function of this ball valve?

No, it only holds true when the actual configuration supports the HART locator.

Is a regular core suitable for all continuous adjustment conditions?

No, relying solely on the actuator's ability to locate is not enough to prove that the valve body is suitable for long-term throttling.