Gate Valve , one of the most widely applied valves, is a valve that opens by lifting a gate/wedge out of the path of the fluid. The gate faces of gate valve could be a wedge shape or be parallel. Gate valves are not suitable for regulating flow, having been designed to be fully opened or closed. When fully open, the gate valve has no obstruction in the flow path, resulting in very high flow coefficient.
Gate valves have either a rising stem or a non-rising stem. Rising stem provide a visual indication of valve position. Non-rising stem is used where vertical space is limited or underground.
Kolink gate valves are supplied with three basic type of body-bonnet closures: bolted bonnet, welded bonnet and pressure seal bonnet. Bolted bonnet, the seal depends on the body-bonnet bolt preload to maintain sufficient compressive force, bolted bonnet is widely used for valves on various pressure ratings and sizes. Welded bonnet is mainly applied for small-size forged steel gate valves, suitable for applications requiring zero leakage on body-bonnet joint when carrying hazardous system fluids. Pressure seal bonnet is adopted for valves for high pressure service, typically in excess of 15 MPa (2250 psi). The body-bonnet joint seals improves as the internal pressure in the valve increases, compared to other constructions where the increase in internal pressure tends to create leaks in the body-bonnet joint.
Kolink gate valves are with flanged ends, butt weld ends, socket weld ends and screwed ends, and are constructed with various materials of cast carbon steel, stainless steel, alloy steels, and forged steels.
Various combinations of seating and stem materials are available to meet specific customer requirements.
The Cross-section of a Typical Cast Steel Gate Valve:
1) Austenitic ductile iron stem nut provides resistance to wear and heat.
4) Spacer rings and double packing sets available upon request.
8) Flexible wedge compensates for seat face distortion and body deformation due to pipe stress.
Gate Valve Cast Steel Gate Valve, Forged Steel Gate Valve, Slab Gate Valve, Wedge Gate Valve Supplier, Knife Gate Valve Wenzhou Kolink Valve Co., Ltd. , http://www.kolinkvalves.com
It is reported that on the eastern side of the Jindi Fuyu District on Yuqiao Road, Pudong New Area, it is adjacent to a landscape river, the Tongyu River. The trees on both sides of the river are lined with pavilions and benches. It is a good place for residents to relax. However, on Saturdays, the river that had originally been clean suddenly smelled dark, and the fish in the river turned up in twos and threes. "What happened to this?"
“Since the beginning of last Saturday, the river water has suddenly become dark and stinky. I was awakened by bad smells in the middle of the night yesterday!†The landscape river suddenly “changes faceâ€, causing residents living along the river to complain and complaining. Ms. Wang said: “Before, People often go fishing and chatting on the river. Everyone likes this river. Nowadays they not only dare not walk to the river, they even have to open windows to tangled up.†“Ms. Wang is worried that if the summer season comes, if problems arise, Residents will be even more miserable if they do not solve the problem, "Occasionally this happened before, but it has since been restored. I hope that this time we can quickly find out where the problem lies. â€
According to the nameplate on the side of the river, the reporter contacted Sanlin River Cleaning Service Co., Ltd., which is responsible for the daily cleaning of the Tonghe River. The person in charge, Mr. Qiao, said that after discovering that the river was stinking last Saturday, it had already been reported to the higher authorities that the water pump that was used to treat the sewage was found to have failed.
According to Mr. Qiao, according to the sewerage regulations, a pressurized pump station should be set up at regular intervals along the river to discharge sewage to offshore sewage treatment plants. The closest pump station to Tonghe River is located near the outer ring of the S20 outer ring. Because of the failure of the pump, the sewage could not be discharged, and it overflowed into the same river, causing anomalies in the river. It is understood that, except for lunch breaks, the cleaning party will occasionally clean up the river from 8 am to 4 pm, and find that domestic garbage and dead fish are timely salvaged. Mr. Qiao said that after the failure of the sewage pump is repaired, the cleaning party will restore the river as soon as possible.
API Gate Valve
Pressure Seal Gate Valve
Forged Steel Gate Valve
2) Rising stem with precision trapezoidal threads for long-lasting service.
3) Two piece self-aligning Gland Bushing and Gland flange prevent stem damage.
5) Machined backseat designed to relieve back pressure on the stem packing when fully seated. Replacing stem packing under pressure is not recommended.
6) Renewable welded-in or screwed-in seats provide a bubble tight joint.
7) Wedge disc fully guided and precision fitted to ensure tight sealing performance.