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About door closers, you need to know these

July 03 , 2023

door closer

1. The working principle of the door closer

1. The basic components of the hydraulic door closer include supporting guides, transmission gears, return springs, one-way valves, rack plungers, throttle valve cores and housings, end covers, sealing rings and connecting rods. The shell and connecting rod play the role of fixing the door closer and connecting the door leaf and the door frame.

2. The working principle of the door closer is: when the door is opened, the door body drives the connecting rod to move, and makes the transmission gear rotate, driving the rack plunger to move to the right. When the plunger moves to the right, the spring is compressed, and the hydraulic oil in the right chamber is also compressed. The one-way valve ball on the left side of the plunger is opened under the effect of oil pressure, and the hydraulic oil in the right cavity flows into the left cavity through the one-way valve. When the door opening process is completed, because the spring is compressed during the opening process, the accumulated elastic potential energy is released, and the plunger is pushed to the left, driving the transmission gear and the door closer connecting rod to rotate, and the door is closed.

3. During the release process of the spring, because the hydraulic oil in the left chamber of the door closer is compressed, the one-way valve is closed, and the hydraulic oil can only flow out through the gap between the housing and the plunger, and through the small hole on the plunger And 2 flow passages equipped with throttle spool return to the right chamber. Therefore, the hydraulic oil constitutes resistance to the release of the spring, that is, the effect of buffering is achieved through throttling, and the closing speed of the door is controlled. The throttle valve on the valve body can be adjusted to control the variable closing speed of different stroke sections. Although the structure and size of door closers produced by different manufacturers are different, the principle is the same.


2.Automatic Door Closer Installation Steps


Hydraulic Door Closer


3.the door closer, how to adjust the closing force?

Adjusting the closing force of the door closer means adjusting the closing speed. When the force is large, the speed is fast, and when the force is small, the closing speed of the door closer is slow.

The door closer adjusts the closing speed through two hydraulic valves to independently control the closing speed of the two-stage door closer for full-stage hydraulic control.

Adjust the closing speed of the door closer as required. Usually the door closer has 2 speed regulating (throttle spool) screws. The upper adjusting screw is the first stage door closing speed adjusting screw, and the lower adjusting screw is the second stage (usually 10º) door closing speed adjusting screw.


4. What should be paid attention to when using the door closer?

(1) The exterior-mounted top door closer is not suitable for two-way opening doors;

(2) The speed adjustment screw controls the opening and closing speed of the door. Clockwise rotation is slow, counterclockwise rotation is fast;

(3) The door closer should be filled with antifreeze oil after one year of use. When refueling, unscrew the oil hole screw to refuel, and tighten the screw after the oil is full

(4) The rest of the screws and sealing parts cannot be twisted at will to prevent oil leakage.

(5) After a period of operation of the hinge with added grease, the viscosity of the added grease decreases and it is easier to flow out. At the same time, the shaft core and reel of the hinge will be worn to varying degrees. When the wear is serious, more black iron powder will be produced, which will stain the grease black. Therefore, depending on the oil used and the processing accuracy of the hinge with grease, transparent or black grease will flow out sooner or later, which will affect the appearance to varying degrees.


Author:Written by Ms.Rebecca Fu from S4A INDUSTRIAL CO.,LIMITED

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  S4A-Security For All.S4A Industrial Co., Limited, Founded in 2010, We have been dedicating in access control production R&D and sales for 10year till now. With the belief that we do one thing well in a lifetime, our CEO has been in this industry for 15 years. During the past 10 years, our products have been exported to various countries and regions. And 90% of customers come from the recommendations of cooperative customers, and 80% of the turnover comes from cooperative customers in the past 10years.Your business is a plant, we are the gardener, our mission is to water and fertilize the plant, and make it become the towering tree. We attach great importance to the partner's appeal, customer's suggestions, and feedbacks. To strengthen Product quality awareness, client's service awareness. Our clients and S4A are on the same path walking for many years.       S4A's future would be even more brilliant, this is related to all of our staff's working sweat. When you join this team, you will feel an invisible power to drive walk forward. S4A mainly produces a series of security Door Access Control such as:Network Access Controller, Locker board, Electromagnetic lock, Standalone door Controller, Automatic door opener, etcOur team can manufacture products, sell products, and do after-sales.In the realm of access control, one company stands out for its unwavering commitment to providing security services for everyone. S4A, which stands for "Security for All," has been at the forefront of access control technology for the past 13 years. With its own state-of-the-art factory and a strong focus on research and development, S4A has continuously delivered cutting-edge access control machines with the latest functions. Their dedication to product quality, customer feedback, practicability, and cost performance sets them apart as a leader in the industry.Factory and R&D Expertise:S4A takes pride in its fully-equipped factory, where skilled engineers and technicians work tirelessly to develop and manufacture access control solutions that meet the highest standards. The company's investment in research and development has resulted in a steady stream of innovative products that cater to evolving security needs.By staying ahead of the curve, S4A ensures that their customers have access to the latest advancements in access control technology.Quality Assurance and Customer Feedback:At S4A, product quality is of paramount importance. The company adheres to rigorous quality control procedures throughout the manufacturing process to guarantee the reliability and durability of their access control machines. Each product undergoes comprehensive testing to ensure it meets industry standards and exceeds customer expectations. S4A also places great value on customer feedback, actively seeking input to continuously improve their products and services. By listening to their customers, S4A maintains a customer-centric approach and delivers solutions that address real-world security challenges.Practicability and Cost Performance:S4A understands that access control solutions must not only be technologically advanced but also practical and cost-effective. The company's emphasis on practicability means that their products are designed to be user-friendly, easily integrated into existing systems, and adaptable to various environments. S4A's access control machines are known for their intuitive interfaces, simple installation processes, and seamless compatibility with other security systems. Additionally, S4A strives to provide cost-effective solutions without compromising on quality. Their competitive pricing ensures that security is accessible to businesses and individuals of all sizes.With 13 years of industry experience, S4A has cemented its position as a leading provider of access control solutions. Through their dedication to "Security for All," the company has set a benchmark for excellence in product quality, customer satisfaction,practicability, and cost performance. S4A's in-house factory and research and development capabilities enable them to stay at the forefront of technological advancements in the field of access control. As the company continues to evolve and innovate, S4A remains committed to empowering individuals and organizations with the highest level of security, ensuring that everyone can enjoy the peace of mind that comes with a reliable and efficient access control system.We can create value for you!Quality takes great importance for a company's credibility, and buyer's every penny spend must worth it. That is our most basic principle. Our business mainly for wholesale, so we could offer large quantities at competitive prices. During the past 10 years, We work hard to create value for our customers, and with our help, customers have an increasing market share. 99% of the customer...<
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    Factory Address:Building S4A, South Third Lane, Qiuyuling Street, Zhangkeng Village, Hengli Town, Dongguan City, Guangdong Province Office Address:#601,floor 6 ,building 1,JINFANGHUA industrial zone, Bantian St. Longgang Dist. Shenzhen, PRC.

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