请教对60335-2-54章节22.7的理解

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如题请教：一般的steam cleaner (非压力型)是否也需要 pressure-limiting protective device ？
看22.7的要求好像是这个意思。
The steam outlet of instantaneous steam cleaners is sealed and the pressure in the water
container is raised hydraulically until the pressure-limiting protective device operates. The
pressure shall not exceed three times the pressure measured during the test of Clause 11.
The outlet of the protective device is then sealed and the pressure is further raised to twice
the previous value. The pressure is maintained for a period of 60 s. There shall be no leakage
from the container.
还有一个疑问22.7 Replacement:
Pressurised appliances shall incorporate adequate safeguards against the risk of excessive
pressure.这节好像是对Pressurised appliances的测试要求，怎么把 instantaneous steam cleaners 也搞进去了？

NOTE 101 An instantaneous steam cleaner is an appliance in which small quantities of water are pumped from
the water container, the steam being produced when the water contacts the heated surface of the steam chamber.
The water container and the steam chamber are at atmospheric pressure.