Valve drive force auxiliary device by means of a power assist device, in the case where the opening pressure of the safety valve opens forcibly than normal. This safety valve for opening pressure is very close to the working pressure of the occasion, or the need to regularly open the safety valve for inspection or blow adhesion, medium frozen occasion. At the same time cast steel valves, also provides a means to force in case of an emergency relief valve to open. Equipment or pipeline A27H springs inching safety valve for ≤200 ℃ operating temperature of the water, air, steam and other media. A27Y applicable to operating temperature ≤200 ℃ have equipment or pipeline Shandong steel valve corrosive media, as the overpressure protection device. Shandong Everbright Valve Co., Ltd. specializes in producing steel valve valve manufacturer prices, welcomed the new and old customers to order our products! Direct acting valve direct-acting valve is opened under the direct action of the working medium, which rely on the role of the working medium pressure against the biasing mechanism is applied to the valve flap mechanical load, the valve open. This safety valve has a simple structure, quick action, good reliability advantages. But because relying on the structure of load, the load size is limited and can not be used for high-pressure, large diameter occasions. Steel valve manufacturers, cast steel valves, Valve Co., Ltd. Shandong by Shandong Everbright Everbright valve. Shandong Everbright Valve Co., Ltd. (www.sdgdfm.com) in this field ball poured boundless enthusiasm and passion, Everbright valve has been customer-centric, the concept of creating value for customers, quality, service to win market, and sincerely hope to work with the community to create success, to create brilliant. Related businesses welcomed the inquiry, Contact: Manager Ma.