Name: TANGGONG Industrial Control Valve Series
Brand: TANGGONG VALVE GROUP
Availability: InStock
Rating: 4.7 (58 reviews)

Question 1

What is the difference between a control valve and a shut-off valve?

Accepted Answer

A control valve is designed for continuous modulation — it throttles flow to maintain a desired process variable (flow rate, pressure, temperature, level). It operates under 4-20mA or digital signal control. A shut-off valve is designed for on/off service only — it is either fully open or fully closed, providing tight isolation with minimal pressure drop when open.

Question 2

What is the difference between pneumatic and electric control valves?

Accepted Answer

Pneumatic control valves use compressed air (typically 4-7 bar) to drive a diaphragm or piston actuator. They are fail-safe (spring-return), explosion-proof, and fast-responding — ideal for hazardous areas (refineries, chemical plants). Electric control valves use an electric motor actuator with 4-20mA or Modbus control. They are easier to install (no air supply), offer precise positioning, and are suitable for remote/automated plants without instrument air systems.

Question 3

What is cage-guided trim in control valves?

Accepted Answer

Cage-guided trim uses a cylindrical cage with precision-machined ports to guide the valve plug and shape the flow characteristic (linear, equal percentage, or modified). Cage-guided designs provide low noise, anti-cavitation, and high capacity. The cage also absorbs hydrodynamic forces, reducing vibration and extending trim life. TANGGONG cage-guided control valves are available in ANSI/FCI 70-2 Class IV, V, and VI shutoff ratings.

Question 4

How to size a control valve for my application?

Accepted Answer

Control valve sizing requires: (1) process fluid properties (density, viscosity, vapor pressure), (2) expected flow rate range (min/max/normal), (3) upstream and downstream pressures, (4) temperature, and (5) allowable pressure drop. TANGGONG's engineering team provides free valve sizing calculations per IEC 60534 — send us your process data sheet and we will recommend the correct Cv/Kv and valve type.

Question 5

What certifications do TANGGONG control valves have?

Accepted Answer

TANGGONG control valves are manufactured under ISO 9001:2015 quality management, tested to ANSI/FCI 70-2 shutoff standards (Class IV/V/VI), and certified to CE and SGS standards. Third-party inspection by TUV, SGS, or DNV is available for specific projects. SIL-capable designs per IEC 61508 are available on request.

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