Qingdao Shuangjunli Machinery Manufactory specializes in design, manufacture and installation of temperature control equipment. For years it has committed itself to energy conservation and environment protection and has made a good example in the two aspects. Since its inception, it has initiatively taken part in international communications and cooperation. Its products have reached advanced international level .
Linkage and Spring
The plastic linkage is changed to aluminum alloy , so the deformation will not happen in the future.
The spring is made of high quality 304 stainless steel,It ensure to close the shutters in place.
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