Automatic on/off valve operation description valve parameters of plastic diaphragm valve, plastic diaphragm valve use meson, adapt to temperature

Automatic on/off valve operation description valve parameters of plastic diaphragm valve, plastic diaphragm valve use meson, adapt to temperature

Automatic on/off valve operation instructions
Automatic valve operation is not much, as long as the opening pressure or inlet and outlet pressure is set before leaving the factory.
1. The relief valve
The safety valve should be pressed, tested and set before installation, and the safety valve used in some places should be tested by the local inspection bureau before it can be used. Steam safety valves for power stations, for example, require on-site verification. In the calibration, to be organized, prepared, and should be clear division of labor. Thermal calibration application standard meter, when the constant pressure value is not accurate, should be regulated according to the provisions. Spring selection of pressure and pressure to adapt to the use of the hammer should be adjusted to a constant pressure value, fixed down.
When the safety valve runs for a long time, the operator should pay attention to the inspection. Inspectors should avoid the exit of the safety valve, check the sealing surface of the safety valve, with a wrench from the handle of the safety valve, open once at an interval of time, diarrhea dirt, verify the flexibility of the safety valve.
2. The pressure reducing valve
Before the pressure reducing valve is enabled, the bypass valve or flush valve should be opened to clean the dirt in the pipeline. After the pipeline is cleaned, the bypass valve should be closed and the pressure reducing valve should be opened to work. There is trap, before some of the steam pressure reducing valve valve need to be open, micro pressure reducing valve open again after the cut-off valve, the pressure reducing valve after zui before the cut-off valve open, watch the pressure reducing valve and pressure gauge, adjust the relief valve adjusting screw, the valve after pressure to the expected value, then slowly open the shut-off valve after pressure reducing valve, valve after pressure correction, until reach the specified value, Then fix the adjusting screw and cover the protective cap.
If the pressure reducing valve is faulty and needs to be repaired, the bypass valve should be opened and cut off before closing the valve. The bypass valve should be roughly adjusted manually so that the pressure after the pressure reducing valve is basically at a predetermined value, and then the cut-off valve after the pressure reducing valve is closed, and the pressure reducing valve should be replaced or repaired. Wait for the pressure reducing valve replacement or repair after the resumption of work.
3. Check valve
Check valves shall be operated to avoid excessive impact force due to valve closure and to avoid rapid vibration of valve closure parts.
To avoid excessive impact pressure from closing the valve, the valve must be closed quickly to prevent the extreme backflow velocity that is the cause of impact pressure when the valve is suddenly closed. Therefore, the closing speed of the valve should be correctly matched with the reduction of downstream media.
4. The trap
Trap is easy to be blocked by sewage and other debris of the valve. When it is enabled, first open the flushing valve, flush the pipeline, with the bypass pipe, can open the bypass valve seat for short flushing, no flushing pipe and bypass pipe trap, trap can be removed, open the cut-off valve after flushing, then close the cut-off valve, install the trap, and then open the cut-off valve, start the trap.
Plastic diaphragm valves are used for temperature adaptation using mesons
Plastic diaphragm valve is a special form of truncation valve, appeared in 20 years of the 20th century. Its opening and closing parts are a diaphragm made of soft material, separated from the valve body cavity and the valve cover cavity and driving parts, so called diaphragm valve.
Due to the plastic diaphragm valve has the advantages of light weight, corrosion resistance, no adsorption scale, and plastic pipeline integration connection and long service life, plastic diaphragm valve in water supply (especially hot water and heating) and other fluids in the industrial plastic pipeline system, its application advantages are other valves can not be compared. Plastics in domestic production and application of stop valve, its control is no reliable way, water supplies and other fluid plastic valves used in industry product quality is uneven, the engineering application of closed lax and leakage phenomenon is serious, the formation of a plastic diaphragm valve cannot use, affect the overall development of plastic pipe application. The national standard of plastic valve in Our country is in the process of making, its product standard and method standard are made according to the international standard.
The main types of plastic valves in the world are ball valve, butterfly valve, check valve, diaphragm valve, gate valve and globe valve, etc., the structure form is mainly two-way, three-way and multi-way valve, the main raw materials are ABS, PVC-U, PVC-C, PB, PE, PP and PVDF.
Fengquan brand plastic diaphragm valve and pipeline system connection methods are
Welding connection: the outer diameter of the valve connection part is equal to the outer diameter of the pipe, and the end face of the valve connection part is welded relative to the end face of the pipe;
Socket bonding connection: the connecting part of the valve is in the form of socket, which is bonded with the pipe fittings;
Electric fusion socket connection: the valve connection part is the socket form with electric heating wire in the inner diameter, and is electrically fused with the pipe;
Socket hot melt connection: the valve connection part is the socket form, and the pipe is connected with the hot melt socket;
Socket bonding connection: the valve connection part is in the form of socket, and the pipe is bonded socket connection;
Bearing rubber sealing ring connection: the valve connection part is the bearing form of inlaid rubber sealing ring, and the pipe is connected with the socket;
Flange connection: the valve connection part is in the form of flange, connected with the flange on the pipe;
Thread connection: the valve connection part is in the form of thread, connected with the thread on the pipe or pipe fittings;
Live connection: the connection part of the valve is in the form of live connection, and the pipe or pipe fittings are connected.
Different connections can be made simultaneously on the same valve.
Use pressure and temperature relationship
With the increase of temperature, the service life of plastic diaphragm valve should be shortened. To maintain the same service life, you need to reduce the service pressure.
Fengquan plastic diaphragm valve advantages:
Wide operating temperature range: 0¡æ -95¡æ
Strength and toughness
Excellent chemical corrosion resistance
Flame retardant property is self – extinguishing
Low thermal conductivity, 1/200 of steel
The content of heavy ions in the medium reaches that of ultrapure water
Health indicators meet the national health standards
Safe and convenient, can use adhesive, thread, flange, welding and other connections
Excellent aging resistance and uv resistance, under normal conditions of use than the ordinary valve life is much longer.
Plastic diaphragm valve details
Scope of use and structural features:
1. Suitable for conveying and blocking of corrosive medium, flow adjustment, according to different materials using temperature -14¡æ ~ 100¡æ, -40¡æ ~ 140¡æ.
2. Flow parts color RPP,UPVC,CPVC,PVDF injection parts assembled, excellent corrosion resistance, easy to operate, light weight, can replace stainless steel valves.
3. Diaphragm of seal is made of F46 or PFA, folding times ¡Ý1200 times, corrosion resistance is equivalent to F4.
4. Screw lifting structure, large opening and closing torque, good stability.
Installation and use of diaphragm valve:
1. When connecting flanges at both ends with pipes, tighten bolts evenly to prevent flange deformation and leakage.
2. Turn the handle clockwise to close, otherwise open.
3. Determine the opening degree according to the position of the indicator.