Flat gate uses: plate valve for natural gas , petroleum, chemical, environmental protection , urban pipelines , gas pipelines and other pipelines , the venting system and vapor storage device used for hoisting equipment . Z43 model with diversion hole single gate type plate valve for natural gas extraction and purification of long- distance pipelines .
Diversion hole plate valve needs through ball for pipeline pigging , no diversion hole plate valve does not need to pass the ball on the pipeline pigging .
Applicable occasions
1 , Oil and gas pipelines. Flat gate valve with diversion hole is also easy to clean pipelines.
2 , Refined oil pipelines and storage facilities.
3 , Mining wellhead oil, natural gas , that is, Christmas tree valves .
4 , The pipeline medium with suspended particles .
5 , City gas pipelines.
6 , Water works.
Flat gate structure described
1, To cast a flat structure , there are two forms of the body , usually nominal pressure ≤ 2.5MPa, or ≤ 300Lb time ,> 2.5MPa or > choice when casting round structure 300Lb .
2 , The seat is PTFE or filled PTFE ring inlaid rigid floating seat with double sealing effect by the end portion of the valve seat ring ○ plus I screwed tight power by floating seat piston reaches the import and export the same time sealing effect this double sealing structure and the valve body cavity is completely isolated from the channel can repair the valve in the working state , the body cavity to exclude residues .
3, The gate is a rectangle parallel to the flat , open a channel on the same diameter through-hole ( with diversion hole ) , or not opening (without diversion hole ) , the full- Kai , the channel is smooth and straight pipe , low flow resistance coefficient , pressure loss, when the gate opened and closed with the valve seat is always in contact with each other , you can wipe attached to the sealing between the particles of dirt , they can not be directly sealing surface erosion medium to be protected.
Flat gate features:
1 Seat seal structure there should be flexibility preload, the upstream and downstream sealing seat while sealing structure. The seal between the valve seat and the sealing face is always .
2 Seat has self-cleaning function, and open or close the process from direct airflow scour valve . Seat should have made lubrication , do not wear material.
3 Valve actuator failure will not affect the other parts of the valve, repair and replacement work can be performed without removing the valve.
( 2 ) Stem - thread length until bracket ; pins and welding ; has stability.
( 3 ) Pressure seal - a simple structure , configuration, staging buckles and silver plated low carbon steel washers, helps to achieve the best removal and bonnet seal .
( 4 ) Seat ring - welded seat ring perpendicular to the flow channel , and easy to maintain .
( 5 ) Executive agencies - these valves can be configured electric, hydraulic or pneumatic actuator. DN300 following configuration standard manual handwheel , DN350 above configuration helical gear operator .
( 6 ) Yoke - fully assembled yoke through seismic testing, ease of maintenance and installation actuators.
( 7 ) Gland - two-piece , self-adjusting gland , to avoid being ejected.
( 8 ) The whole back seat - hard surface , the longest service life .
( 9 ) Valve - the valve spring load can adjust itself to reduce the torque requirements of the actuator.
( 10 ) Overall stopper - stopper bracket integrally cast , positioning the valve assembly bracket such that the seat is more stable and reliable.