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

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.

What is the difference between pneumatic and electric control valves?

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.

What is cage-guided trim in control valves?

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.

How to size a control valve for my application?

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.

What certifications do TANGGONG control valves have?

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.

top-guide single-seated control valve

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

The cage-retained seat provides high reliability and easy maintenance, overcoming leakage repair issues of traditional baseless structures and prolonging service life. Adopting flow-to-open design, the medium moves toward valve opening direction, with stable control at small opening and slight flow characteristic distortion. Electric or pneumatic actuators are optional based on working conditions.
Design & Manufacturing Standard: IEC 60534
Face-to-Face: IEC 60534-3-1
End Flange: ASME B16.5 / GB/T 9113
Pressure-Temperature Rating: ASME B16.34
Testing Standard: IEC 60534-4
Leakage Class: IEC 60534-4
Pressure Rating:PN1.0MPA-PN42.0MPA (ASI150-2500LB)
Size Range:DN20-DN500
Operation Mode: Electric / Pneumatic

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Product Detail

Main Applications

1. Temperature Regulation: Automatically regulates hot water/steam flow in air conditioning, heating, boilers, and heat exchange stations to control room and water temperature stability, achieving constant temperature control.

2. Flow Rate Regulation: Precisely controls the flow rate of water, oil, gas, and chemical media in pipelines to meet production process ratios and delivery requirements.

3. Pressure Regulation: Stabilizes, reduces, and releases pressure to maintain constant pressure in pipelines and equipment, preventing overpressure or underpressure.

4. Level Regulation: Automatically replenishes/drains water from water tanks, storage tanks, and pools to maintain stable liquid levels.

5. Process Automation: Works with PLCs, sensors, and temperature controllers to achieve unattended automatic control, replacing manual adjustments.

6. Safety Protection: Automatically shuts down/adjusts in case of abnormalities to prevent overheating, overpressure, and leakage, ensuring system safety.

Common Application Scenarios
● HVAC: Central air conditioning chilled/hot water, underfloor heating, fresh air systems
● Heating and Cooling: Residential heating, industrial boilers, steam pipelines
● Chemical and Petrochemical: Acid and alkali, oil, gas medium regulation
● Power Industry: Power plant cooling water, steam systems
● Water Supply and Drainage: Tap water, sewage treatment, pumping stations
● Food and Pharmaceutical: Pure water, pharmaceutical flow and temperature control

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