Plz help me with the english comprehension?

"the valves with reference stroke times of less than or equal to 10 sec shall exhibit not more than a plus minus 25% nor plus minus 1 sec change in st

"the valves with reference stroke times of less than or equal to 10 sec shall exhibit not more than a plus minus 25% nor plus minus 1 sec change in stroke times, whichever is greater" what if in case of a valve of 10 sec refernece stroke times, then change in stroke be opted for plus minus 25% not 1 sec?? Is it right?

or:\"the valves with reference stroke times of less than or equal to 10 sec shall exhibit not more than a plus minus 25% nor plus minus 1 sec change in stroke times, whichever is greater\" what if in case of a valve of 10 sec refernece stroke times, then change in stroke be opted for plus minus 25% not 1 sec?? Is it right?


or:\"The valves with reference stroke times of

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