Dongda Pump Valve — Specializing in the production of flat gate valves, pneumatic shut-off gate valves, parallel double gate valves, oilfield special valves...
The flat gate valve is suitable for oil, natural gas, water, oil and other pipelines with Class150～900/PN1.0～16.0MPa and working temperature of -29～121℃ to cut off or connect the medium in the pipeline.
The flat gate valve is suitable for natural gas, petroleum, chemical, environmental protection, urban pipelines, gas pipelines and other transportation pipelines, venting systems and steam storage devices, as opening and closing equipment.
1. For oil and natural gas pipelines, use single or double gate flat gate valves. If you need to clean the pipeline, use single or double gate open-rod flat gate valve with diversion holes.
2. For the transportation pipeline and storage and transportation equipment of refined oil, select single gate valve without diversion hole or light flat gate valve.
3. For oil and natural gas extraction wellhead devices, single-gate or double-gate flat gate valves with dark rod floating valve seats and diversion holes are used, most of which are API16A standards, and the pressure levels are API2000, API3000, API5000, API10000, API15000, API20000.
(2 1/16”- 7 1/16” 2000-20000 PSI PR1. PR2 PSL1-PSL4 AA. BB. CC. DD. EE. FF)
4. For pipelines with suspended particles, use hard-sealed flat gate valves or knife-type flat gate valves.
5. The city gas transmission pipeline uses a flat gate valve dedicated to buried gas with a dark rod.
6. For urban tap water projects, single-gate soft-sealed open-rod flat gate valve is selected.
1. The valve seat adopts an O-ring seal and a floating seat structure that applies pre-tightening force to seal the inlet and outlet of the flat gate valve in both directions; and the opening and closing torque of this structure is only 1/2 of that of ordinary valves, which can achieve easy opening and closing. Close the valve
2. When fully opened, the channel is smooth and straight, the flow resistance coefficient is extremely small, and there is no pressure loss, and the pipeline can be cleaned by the hair ball
3. The packing structure with self-sealing capability is adopted, without frequent adjustment, the opening and closing are extremely light, and the sealing performance is reliable. There is an auxiliary sealing grease injection structure at the stuffing box, the sealing performance is absolutely reliable, and the zero leakage is truly achieved; it solves the general purpose Disadvantages of easy leakage at valve packing
4. When the flat gate valve is closed, the high pressure in the cavity can be automatically removed to ensure safe use
5. Fully enclosed structure, good protection performance, can adapt to all-weather requirements
1. The sealing structure of the valve seat should be elastic and pre-tightened, and the upstream and downstream sealing seats are sealed at the same time. The valve seat and the seal are always face-to-face sealing.
2. The valve seat has a self-cleaning function, and is not directly washed by air flow during the opening or closing of the valve. The valve seat should be made of lubricated, non-wearing material.
3. The failure of the valve actuator will not affect other parts of the valve. Repair and replacement work can be carried out without removing the valve.
(1) Yoke sleeve-The aluminum bronze yoke sleeve is equipped with needle-shaped thrust bearings, which greatly reduces the operating torque.
(2) Stem-thread length up to the bracket; pin and spot welding; stable.
(3) Pressure seal-simple structure, equipped with segmented retaining ring and silver-plated low carbon steel gasket, which is helpful for disassembly and realization of good bonnet sealing.
(4) Seat ring-Welded seat ring is perpendicular to the flow channel, easy to maintain.
(5) Actuator-These valves can be equipped with electric, hydraulic or pneumatic actuators. Standard manual handwheels below DN300, helical gear operating mechanisms above DN350.
(6) Yoke-The fully assembled yoke has passed the seismic test and is easy to maintain and install the actuator.
(7) Gland-Two-piece, self-adjustable gland to avoid ejection.
(8) Integral rear seat-hard surface, long service life.
(9) Disc-The spring-loaded disc can be adjusted by itself, reducing the torque demand of the actuator.
(10) Integral stop-integrally cast bracket stop device to position the assembled bracket disc, making the valve seat more stable and reliable.
Design and manufacturing standards: API 6D GB/T 19672
Structure length standard: API 6D GB/T 12221
Connecting flange standard: ASME B16.5 HG/T 20592
Pressure and temperature rating: ASME B16.34 GB/T 12224
Test inspection standard: API598 GB/T 13927
Parts materials and working conditions:
Water, oil, steam
Particles, crude oil
Water, oil, steam
If you have any questions about quotation or cooperation, please feel free to contact us by phone 0577-67966500 or use the enquiry form below. Our sales representative will contact you within 24 hours. Thank you for your interest in our products.
Dongfang Industrial Zone, Jiangbei Street, Wenzhou, Zhejiang