YY/T 1957-2025Vacuum washer-disinfectors (English PDF)
负压清洗消毒器
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Issued by
NMPA
Level / Type
Industry · Recommended
Issue date
February 26, 2025
Implementation date
September 1, 2026
Scope
YY/T 1957-2025 is the English-translated version of 负压清洗消毒器.
YY/T 1957-2025 is the Chinese standard "Vacuum washer-disinfectors". Its scope clause reads: This document specifies the performance requirements for negative pressure washer-disinfectors and describes the corresponding test methods.
This document is applicable to cleaning and disinfection equipment with negative pressure cleaning function and in compliance with the applicable clauses in YY/T 0734.1 and the requirements of the corresponding special standards.
Poison weapon. This document does not apply to washer-disinfectors that do not have negative pressure cleaning function. Its clauses include terms and definitions.
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Document preview — YY/T 1957-2025
National Standard of the People's Republic of China
- ICS
- 11.080.10
- Classification
- C47
Issued by: National Medical Products Administration
Contents
- Preface
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Performance requirements
- 5 Test methods
- Appendix A (Normative) Relationship between the boiling point of water and pressure
1 Scope
This document specifies the performance requirements for negative pressure washer-disinfectors and describes the corresponding test methods.
This document is applicable to cleaning and disinfection equipment with negative pressure cleaning function and in compliance with the applicable clauses in YY/T 0734.1 and the requirements of the corresponding special standards.
Poison weapon.
This document does not apply to washer-disinfectors that do not have negative pressure cleaning function.
2 Normative references
The contents of the following documents constitute essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB 8599-2023 Technical requirements for large pressure steam sterilizers
YY/T 0734.1-2018 Washer-disinfector Part 1.General requirements and tests
3 Terms and definitions
The terms and definitions defined in YY/T 0734.1-2018 and the following apply to this document.
3.1 A0 value
The equivalent time measured in seconds during moist heat disinfection at 80°C is taken as 10°C.
[Source. YY/T 0734.1-2018, 3.1]
3.2 Bubble Generator
A device that introduces external filtered air into the cavity and evenly generates bubbles in the water during the liquid phase pulsating cleaning process.
3.3 Bubble washing
The cleaning method utilizes the pressure difference between the inside and outside of the cavity and generates bubbles through a bubble generating device to achieve load cleaning.
3.4 Chamber
Negative pressure washer-disinfector A device that handles loads and withstands negative pressure environments.
3.5
The water in the cavity is pumped to a boiling state under negative pressure at a set temperature, and the filtered air from the outside is returned to the liquid surface through the gas phase.
The empty pipe is introduced into the cavity and quickly re-pressurized, so that the water inside the cavity flows back and forth many times to achieve the purpose of stripping pollutants.
Cleaning method.
3.6 Hot air drying
A method that uses flowing hot air to increase the surface temperature of the load and remove residual moisture.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
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Related Standards
GB 8599-2023 — Technical requirements for large steam sterilizers
YY/T 0734.1-2018 — Washer-disinfectors - Part 1: General requirements and tests
YY/T 0297-2026 — General requirements for clinical investigation of medical devices
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