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.

Electric high temperature control valve

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

Electric high‑temperature control valve is mainly used for automatic regulation of flow rate, pressure and temperature of high‑temperature media such as high‑temperature steam, heat‑conducting oil and hot water.
It is widely applied in thermal power plants, petrochemical industry, metallurgy, heating system and other high‑temperature working conditions.
- GB/T 12224 General requirements for steel valves
- GB/T 12221 Face-to-face, end-to-end and centre-to-face dimensions of metal valves
- GB/T 13927 Pressure test for industrial valves
- GB/T 26480 Inspection and testing of pipeline valves
- GB/T 17213 Industrial process control valves
- JB/T 8528 General technical requirements for electric valve actuators

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Product Detail

ZDLQ, ZDLX type electronic three contacts regulating is 3610L series electronic actuator with three contacts regulating agencies.

Have servo system within electric actuating mechanism, need not match servo amplifier in addition, have three control signal power source to be OK to control a travel, be linked with the line simplicity. Buffer pool has confluence and defiance two kinds of ways, occasion can replace two valves and three direct links taking over but gets extensive use in some. Two-phase adjustment simple being qualified for being often used for exchanger are compared to adjustment.

Main technical parameters regulating agencies：

Item		25	32	40	50	65	80	100	125	150	200	250	300
Nominal diameter DN (mm)	Confluence	25	32	40	50	65	80	100	125	150	200	250	300
	Dimensions						80	100	125	150	200	250	300
Seat diameter (mm)		26	32	40	50	66	80	100	125	150	200	250	300
Rated flow coefficient (KV)	Confluence	8.5	13	21	34	53	85	135	210	340	535	800	1260
	Dimensions	8.5	13	21	34	53	85	135	210	340	535	800	1260
Nominal pressure PN (MPa)		4.0,6.4	4.0,6.4	4.0,6.4	4.0,6.4	4.0,6.4	4.0,6.4	4.0,6.4	4.0,6.4	4.0,6.4	4.0,6.4	4.0,6.4	4.0,6.4
Travel (mm)		16	16	25	25	40	40	40	40	60	60	100	100
Matches the implementing agency model		361LSA-20 361LXA-20	361LSA-20 361LXA-20	361LSB-30 361LXB-30	361LSB-30 361LXB-30	361LSB-50 361LXB-50	361LSB-50 361LXB-50	361LSB-50 361LXB-50	361LSB-50 361LXB-50	361LSC-65	361LSC-65	361LSC-99	361LSC-99
Flow characteristics		Straight line	Straight line	Straight line	Straight line	Straight line	Straight line	Straight line	Straight line	Straight line	Straight line	Straight line	Straight line
Adjustable ratio		30:1	30:1	30:1	30:1	30:1	30:1	30:1	30:1	30:1	30:1	30:1	30:1
Flange size		Cast iron flange by GB/T17241.6, cast steel flange by GB/T9113.1	Cast iron flange by GB/T17241.6, cast steel flange by GB/T9113.1	Cast iron flange by GB/T17241.6, cast steel flange by GB/T9113.1	Cast iron flange by GB/T17241.6, cast steel flange by GB/T9113.1	Cast iron flange by GB/T17241.6, cast steel flange by GB/T9113.1	Cast iron flange by GB/T17241.6, cast steel flange by GB/T9113.1	Cast iron flange by GB/T17241.6, cast steel flange by GB/T9113.1	Cast iron flange by GB/T17241.6, cast steel flange by GB/T9113.1	Cast iron flange by GB/T17241.6, cast steel flange by GB/T9113.1	Cast iron flange by GB/T17241.6, cast steel flange by GB/T9113.1	Cast iron flange by GB/T17241.6, cast steel flange by GB/T9113.1	Cast iron flange by GB/T17241.6, cast steel flange by GB/T9113.1
Body material		WCB(ZG230-450), ZG1Cr18Ni9Ti	WCB(ZG230-450), ZG1Cr18Ni9Ti	WCB(ZG230-450), ZG1Cr18Ni9Ti	WCB(ZG230-450), ZG1Cr18Ni9Ti	WCB(ZG230-450), ZG1Cr18Ni9Ti	WCB(ZG230-450), ZG1Cr18Ni9Ti	WCB(ZG230-450), ZG1Cr18Ni9Ti	WCB(ZG230-450), ZG1Cr18Ni9Ti	WCB(ZG230-450), ZG1Cr18Ni9Ti	WCB(ZG230-450), ZG1Cr18Ni9Ti	WCB(ZG230-450), ZG1Cr18Ni9Ti	WCB(ZG230-450), ZG1Cr18Ni9Ti

Performance index：

Project		Target value
Basic error (%)		±2.5
Backlash (%)		2.5
Dead area (%)		1.0
Always point deviation (%)	Electricity out - Start	±2.5
	Electricity out - End	±2.5
	Power off - Start	±2.5
	Power off - End	±2.5
Allow leakage (l/h)		2.5
Rated stroke deviation (%)		$1 \times 1 0^{-3} \times$ Valve rated capacity

Permissible pressure：

Nominal diameter DN(mm)	25	32	40	50	65	80	100	125	150	200	250	300
Permissible pressure (MPa)	0.32	2.20	2.20	1.41	1.38	0.94	0.61	0.51	0.36	0.20	0.19	0.13

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