Can I manually turn off a Honeywell zone valve #v8043e1061.

Thermostat is off but there is still heat in that zone

V8043E1061 - Honeywell V8043E1061 - 3/4" Sweat Connection Zone Valve, normally closed, 8 Cv (24v) (http://www.supplyhouse.com/Honeywell-V8043E1061-3-4-Sweat-Connection-Zone-Valve-normally-closed-8-Cv-24v?gclid=CNDztcH6tcUCFcWRHwodW2wA2w)
Specifications say that valve can be manually opened. Insure that valve has not manually opened.