What are the two common connections for valves? Structure composition and working principle of electric closed plug valve

What are the two common connections for valves? Structure composition and working principle of electric closed plug valve

Threaded connection This is an easy connection method, often used for small valves. There are two cases: 1, direct sealing: internal and external threads directly play the role of sealing. In order to ensure that the joint does not leak, often with lead oil, linoleum and PTFE raw material filled; Ptfe raw material belt, the use of increasing popularity; This material has good corrosion resistance, good sealing effect, use and storage side
Threaded connections
This is a simple connection method and is often used with small valves. There are two further cases:
1, direct sealing: internal and external threads directly play the role of sealing. In order to ensure that the joint does not leak, often with lead oil, linoleum and PTFE raw material filled; Ptfe raw material belt, the use of increasing popularity; This material has good corrosion resistance, good sealing effect, easy to use and preserve, and when disassembled, it can be completely removed, because it is a non-viscous film, much better than lead oil and linoleum.
2. Indirect sealing: the force of screw tightening is transferred to the washer between the two planes, so that the washer plays the sealing role.
The ACCUMULATION OF HARD RESIDUE, DIRT, OR ANY EXTERNAL MATERIAL IN THE LINE CAN HINDER THE efficiency OF THE valve and seriously damage critical VALVE COMPONENTS. The inside of the pipe must be thoroughly cleaned with air or steam.
When TAPPING PIPE, MEASURE THE SIZE AND length OF PIPE THREADS TO AVOID CLOGGING PIPE WITH SEATS and discs.
Thoroughly clean thread ends to prevent any harmful steel or iron deposits. Use teflon tape or pipe adhesives for stronger welds. Use pipe adhesives only in small amounts on pipe threads, but not *** on valve threads. Do NOT ALLOW any PIPE adhesIVES TO FLOW INTO THE BODY to AVOID damage to DISC AND SEAT.
Before installation, cut off the flow through the valve so that the valve works properly. Close valve completely before installation. Place the wrench on the hex bolt head near the pipe to avoid possible deformation. After INSTALLING THE valve, SUPPORT THE PIPE: SAGGING pipe can deform the valve and cause failure.
Flange connection
This is the most common form of valve connection. According to the shape of the joint surface, it can be divided into the following:
1. Smooth type: used for valves with low pressure. Convenient processing
2, concave and convex type: high working pressure, can be used in the hard washer
3. Tenon and groove type: gasket with larger plastic deformation can be used in corrosive media, and the sealing effect is better.
4, trapezoidal groove: use oval metal ring as washer, used for working pressure ≥64 kg/cm2 valve, or high temperature valve.
5, lens type: the washer is a lens shape, made of metal. For high pressure valves with working pressure ≥100 kg/cm2, or high temperature valves.
6, O ring type: This is a relatively new form of flange connection, it is developed with the appearance of all kinds of rubber O ring, it is more reliable than the general flat washer in the sealing effect.
To ensure proper installation of the flange connection, follow these steps. First carefully clean the joints, then loosely attach two or three bolts to the base. Next, carefully insert the spacer into the joint. The bottom bolt helps to position the gasket and keep it in place. Insert bolts should then be cross-tightened rather than WRAPAROUND, which helps to eliminate too much concentrated pressure. After normal use for a period of time, check that all bolts are tightened and re-tighten as necessary.
Electric closed gate valve is composed of main and auxiliary valve body, valve plate, expansion joint, fixed sleeve, electro-hydraulic push rod clamping mechanism, walking electric installation, limiter, left and right valve body and other components. Valve closing: electro-hydraulic push rod drive spring clamping mechanism, the valve plate off, in place, walking electric start, drive the valve plate walking from open to close, in place, electro-hydraulic push rod reverse motion, spring clamping mechanism automatically clamped in place, the end of valve closing. Open valve is vice versa.
Structure composition and working principle of electric closed plug valve
Electric closed plug valve is composed of main and auxiliary valve body, valve plate, expansion joint, fixed sleeve, electro-hydraulic push rod clamping mechanism, walking electric installation, limiter, left and right valve body and other components. Valve closing: electro-hydraulic push rod drive spring clamping mechanism, the valve plate off, in place, walking electric start, drive the valve plate walking from open to close, in place, electro-hydraulic push rod reverse motion, spring clamping mechanism automatically clamped in place, the end of valve closing. Open valve is vice versa.
Open GATE VALVE, CLOSED GATE VALVE IS SUITABLE FOR METALLURGY, CHEMICAL INDUSTRY, MUNICIPAL GAS pipeline, in line WITH GB6222-86 “INDUSTRIAL ENTERPRISE GAS SAFETY REGULATIONS”. When THE ELECTRIC CLOSED PLUG VALVE IS IN THE CLOSED STATE, completely cut off the medium in the pipeline, to achieve zero leakage sealing, the electric closed plug valve product can be on-site, remote operation, is an ideal gas and harmful, toxic gas pipe network safety partition equipment.
Schematic construction of electric closed gate valve
Main performance specifications for electric enclosed gate valve:
Nominal diameter (mm) : DN800-3600
Nominal pressure (MPa) : 0.05, 0.1, 0.25
Applicable temperature (℃) : ≤260
Applicable medium: gas and other toxic, harmful, flammable gas
Connecting flange standard: in line with GB9115-2000
Electric closed gate valve structure features:
The plugboard valve is composed of a front body, a back body, a valve plate, a telescopic body, a left and right sealing box, a through plate and a blind plate, a switching device, and a loosening clamping device. The loosening clamping device of the metallurgical valve is driven by electric device. The sprocket, chain and screw nut pair are connected, and the expansion of the bellows is driven to realize the clamping or loosening of the valve body seal seat. The valve adopts SPROCket type multi-point clamping mechanism, the sealing ring is double-sided seal, installed on the valve plate, the sealing is reliable and easy to replace. The top guide rail of valve plate is equipped with longitudinal and transverse moving mechanism, and the side is equipped with spring mechanism and limit wheel. When the clamping mechanism is released to release the valve plate, the spring mechanism lifts the valve plate to the limit wheel.