1. Adjusting the valve screw clockwise can reduce the closing force of the door closer.
Adjusting the valve screw counterclockwise can increase the closing force of the door closer.
3. When adjusting, the amplitude must be controlled within a small range.
Door closer is a spring-like hydraulic device on the door head. When the door is opened, it can be released after compression and the door will close automatically. It has the function of spring door, which can ensure the door to close to the initial position accurately and timely after opening.
Modern hydraulic door closers (door closers for short) began with a patent registered by Americans in the early 20th century. Different from the traditional door closer, it achieves the buffering effect by throttling the liquid in the door closer. The core of the design idea of hydraulic door closer is to control the door closing process, so that the functional indexes of the door closing process can be adjusted according to people's needs.
Extended data:
The reduction of the buffering effect of the door closer is caused by the oil leakage into the air or the increase of the fit (throttle) gap between the rack plunger guide cylinder and the valve body. Therefore, the quality and accuracy of materials, heat treatment and machining of pinion and supporting guide rail are very important.
Valve is a pipeline accessory, which is used to open and close the pipeline, control the flow direction, and adjust and control the parameters (temperature, pressure and flow) of the conveying medium. According to its function, it can be divided into cut-off valve, check valve and regulating valve.
Valve is the control part in the fluid conveying system, which has the functions of cutting off, regulating, shunting, backflow prevention, pressure stabilization, shunting or overflow pressure relief. The valves used in the fluid control system, from the simplest cut-off valve to various valves used in the extremely complicated automatic control system, have quite a variety of varieties and specifications.
Valves can be used to control the flow of various fluids, such as air, water, steam, corrosive media, mud, oil, liquid metal and radioactive media. Valves are divided into cast iron valves, cast steel valves and stainless steel valves (20 1, 304, 3 16, etc. ), chrome-molybdenum steel valves, chrome-molybdenum steel valves, dual-phase steel valves, plastic valves, non-standard customized valves, etc.
Valve is a device used to control the direction, pressure and flow of fluid in fluid system, and it is a device to make the media (liquid, gas and powder) in pipelines and equipment flow or stop and control their flow.
Valve is the control part in the pipeline fluid transportation system, which is used to change the cross section of the channel and the flow direction of the medium, and has the functions of shunting, cutoff, throttling, check, shunting or overflow pressure relief. Valves used for fluid control range from the simplest shut-off valve to various valves used in extremely complicated automatic control systems, with nominal diameters ranging from extremely tiny instrument valves to industrial pipeline valves with diameters of 10m.
It can be used to control the flow of various types of fluids, such as water, steam, oil, gas, mud, various corrosive media, liquid metal and radioactive fluids. The working pressure range of the valve is 0.00 13MPa to 1000MPa, and the working temperature range is from ultra-low temperature of c-270℃ to high temperature of 1430℃.
References:
Door closers-Baidu Encyclopedia