| 摘要 |
A pressure control valve for reactive adhesives includes a valve housing with a liquid recirculation passage communicating with a conduit leading to a dispensing apparatus and an adhesive pump, a valve element mounted within the valve housing, and a biasing member for biasing the valve element towards a valve seat in the liquid passage. The pressure control valve also includes a flexible seal with a first end fixedly coupled to the valve element and a second end fixedly coupled to the valve housing. The flexible seal also includes an intermediate portion that flexes or deforms as the first end of the flexible seal follows movements of the valve element, thereby preventing liquid adhesive in the liquid recirculation passage from contacting the biasing member. The flexible seal may include an arch-shaped compression seal or a thin flexible annular membrane.
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