Who invented the modern door closer?
We say modern hydraulic door closers, a patent that was registered by Americans in the early twentieth century. Unlike traditional door closers, buffering is achieved by throttling the liquid in the door closer.
What is the role of the door closer in addition to closing the door?
The core of the hydraulic door closer design idea is to realize the control of the closing process, so that the various functional indicators of the closing process can be adjusted according to the needs of the person. The significance of the door closer is not only the automatic closing of the door, but also the protection of the door frame and the door body (smooth closing). More importantly, the door closer has become an indispensable part of the intelligent management of modern buildings.
Door closers are mainly used in commercial and public buildings, but they are also used at home. They have many uses, the most important of which is to close the door itself to limit the spread of fire and ventilation in the building.
What issues should I consider when choosing a door closer?
Before choosing a door closer, you should consider: door weight, door width, door opening frequency, use requirements and use environment.
Door weight and door width are the premise of choosing the model of the door closer. Generally, the door weight is small and the model with small strength is selected. First, it feels very easy to open the door, and it is also beautifully arranged when installed on the door. Second, the small product is generally economical. vice versa.
The opening frequency is closely related to the quality requirements of the product.
First, the door closer is required to have good sealing performance and no oil leakage. The key is the technology and material of the dynamic sealing. Second, the life of the door closer is required to be long, so as to ensure long-term and normal use after installation, and reduce maintenance. The updated workload and cost, as well as the convenience and enjoyment of the door closer products.
Usage requirements include:
1) Whether there is an automatic door stop function after opening the door
2) Damping buffer function
Damping buffer is generated after quick opening to a certain position, and the damping buffer force and range can be adjusted according to the use requirements; this function is used to prevent the door or lock from colliding with the wall when the door is opened quickly, or to prevent people from opening the door quickly during emergency escape. Lose weight and lean forward to the ground.
3), delay slow closing
The door is slowly closed from the maximum position of the door opening, and can be adjusted step by step according to the requirements. It is suitable for use in ordinary and crowded places, especially in hospitals, with elderly people, children and disabled people, and access doors and passages.
4), closing power adjustable function
It can be installed on different doors with a wide range of door weight and door width, as well as places with large door closing resistance due to environmental reasons. It can be used to adjust the door closing force at random level. It is especially useful in coastal cities, car and ship due to wind resistance. A place that changes from time to time.
5), the use of the environment: fire requirements (fire protection requirements), anti-freeze requirements (the location in the north of the winter minus 35 degrees). 
Editor in charge: Wang Zhen
HASTELLOY®
Hastelloy Availability
Yuhong Group supplies Hastelloy C276, C22, X, B3 and B2. Most of these alloys are available in the form of plate, sheet, bar, pipe, tubing, pipe fittings, flanges and welding material. Request a Quote today on any of these alloys.
The registered trademark name, Hastelloy, is applied as the prefix name to more than twenty different highly corrosion resistant metal alloys produced by Haynes International, Inc. Thesesuperalloys, or high performance alloys, developed by Haynes International, are nickel-based steel alloys that exhibit traits that include high resistance to uniform attack, localized corrosion/oxidation resistance, stress corrosion cracking resistance and ease of welding and fabrication.
Alloys of identical chemical and mechanical properties are available from other manufacturers and offer excellent alternatives to the various Hastelloy® brand alloys.
The corrosion-resistant superalloys are widely used by the chemical processing, aerospace, and industrial gas turbine and marine industries. Additionally, due to the their reliable performance, areas of energy, health and environmental, oil and gas, pharmaceutical and flue gas desulfurization industries are increasingly using them.
What are the Characteristics of Hastelloy ?
High resistance to uniform attack
Outstanding localized corrosion resistance
Excellent stress corrosion cracking resistance
Good resistance to acids such as sulfuric, nitric, hydrochloric, hydrofluoric and chromic
Ease of welding and fabrication
High resistance to oxidation at elevated temperatures
In what Applications are Hastelloy alloys used ?
Chemical Processing Industry
Aerospace
Pharmaceutical
Oil and gas production
Components where exposure to high mechanical stress and sea water are required
Components exposed to flue gas or flue gas desulfurization plants
Superalloys, also known as high performance alloys, have become the steel of choice for corrosion resistance and versatility.
*Hastelloy® is a registered trademark of Haynes International, Inc.
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