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2026
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09
The group standard “Variable‑Area Flowmeter” (T/TMAC 454—2026) has been officially released and put into effect.
The group standard “Variable‑Area Flow Meter” (T/TMAC 454—2026) has been officially released and put into effect.
The group standard T/TMAC 454—2026, “Variable-Orifice Flow Meter,” jointly developed by Tangshan Fengrun District Zhanwang Automation Equipment Co., Ltd. as the lead organization, along with several instrumentation companies and universities, has been officially released by the China Technology Market Association and will come into effect on August 15, 2026.
This standard establishes unified product classification and model‑naming conventions for variable‑area flowmeters; specifies metrological accuracy classes of 0.5, 1.0, and 1.5, along with wide turndown ratios; harmonizes pressure‑rating, explosion‑proof, environmental, and fatigue‑durability test and inspection procedures; and provides standardized installation drawings to standardize on‑site construction, packaging, and transportation requirements.
Compared with conventional flow meters, the variable‑throttle flow meter is compatible with liquids, gases, steam, and other media, covering a temperature range of –40°C to 400°C and a pressure operating range of 0–50 MPa. It features a wide turndown ratio of 100:1 and can accommodate a variety of industrial measurement conditions.
The release and implementation of this group standard also underscores our company’s robust technical expertise in the field of flow measurement. Currently, our variable‑throttle flowmeter products are manufactured in full compliance with the T/TMAC 454—2026 group standard. We offer services such as standard interpretation, product selection, technical support, and on‑site installation guidance, helping industrial users achieve stable and accurate flow measurement.
Note: This standard can be accessed on the National Group Standards Information Platform.
Tangshan Fengrun District Zhanwang Automation Equipment Co., Ltd.
September 3, 2026
Tangshan Fengrun District Zhanwang Automation Equipment Co., Ltd.,Variable-orifice flowmeter
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Key words：Orifice flowmeters、Differential pressure flowmeter、Nozzle flowmeter、Wedge Flow meter、Venturi meter、Balanced flowmeter、V-cone flow sensor
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