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Oilfield special high-pressure gate valve process improvement

admin — Tue, 15 May 2012 08:19:58 +0000

The gate valve of the wellhead equipment (Christmas tree) is the oil field the largest amount of special gate valve, gate valve manufacturing process, the body hydrostatic strength test and the sealing performance test pass rate is too low (30% ~ 70%), and long-termThe troubled manufacturing plant.
China gate valve manufacture-Datian Valve, the specialist of China valve manufacture, main product range: slab gate valve, control valve, ball valve, automatic recirculation valve, gate valve, butterfly valve, globe valve, check valve, choke valve, safety valve, plug valve, diaphragm valve, strainer, pressure reducing valve and valve products.

In this paper, I plant the actual production, the crux of the above problems were analyzed to propose solutions.
A rough casting process improvements
I plant wellhead gate valve with a sand mold cast steel blank, the process in the body, often with the valve seat with internal thread holes, shrinkage and other casting defects by the macro-analysis found that the body section in Figure 1 hot spot area, as shown in varying degrees of shrinkage phenomenon, to solve the above problems, test casting process a number of improvements.
1) improving the Riser system. Pouring riser system to the valve at the bottom set of horizontal straight gate system will be set in the cylindrical surface of both sides of the valve body;
2) change the sand casting investment casting;
3) change the side of the casting method for the top casting method, and the flange down. The investment casting sand casting has better permeability, faster, more uniform cooling conditions, so the organization became more compact. Poured into the molten steel from the top, from the riser directly poured into the Riser location close to the hot spot area. Created extremely favorable order for the casting solidification conditions, the hot spot areas to receive timely feeding, casting dense production after process improvement, eliminating shrinkage, shrinkage and other casting defects, product qualification rate reached more than 99%.

To improve the machine manufacturing precision of the measures
The sealing effect is a key element of the valve manufacturing. The sealing problem has always been difficult to solve the machining industry, is to improve the manufacturing precision of the valve to ensure valve sealing effect.
The body is the most critical processing of the gate valve production, due to the structural requirements for seat sealing surface and the center plane of symmetry tilt 3o 6o for small and medium-sized gate valve body, horizontal lathes and auxiliary plate bending tooling to complete the processing of the seat tilted surface.
In addition, to select the appropriate weight and bending plate is equipped with.

Finally, to ensure the coordination and processing of various parts of the seal pair:
Namely: the consistency of the valve body and gate gradient; the consistency of the body and the processing of the valve plate bending slope; consistency of the gate and turning the gradient plate; the slope of the gate and grinding slope station consistency.
Inter-linkages between the four kinds of consistency, mutual restraint, and rely on each other. Four kinds of consistency, we are lathes slope of the curved plate, after repeated screening, grinding out the standard gradient plate, in turn, then the standard slope of the board to repair the mill gate for turning the slope of tooling, control four kinds of good consistency, productivity increased, and the assembly accuracy can be guaranteed.
In addition, also effective in controlling the valve seat grinding process to ensure that the plane of the seat surface of not less than 100:0.01 to ensure that the surface roughness of the surface from scratch, bump, grind sand the degree of inequality factors, to reach the best results after grinding to ensure the accuracy of the seat.
Through a series of effective measures and quality control, I plant the production wellhead valve product qualification rate of 98% or more.

Reproduced in: http://www.bf35.com/news/detail/18628.html

This week, the key recommendation of a good room (2011-8-26 17:24:09) [sent to microblogging]

admin — Fri, 04 May 2012 17:17:27 +0000

August 26, 2011
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Name: Jing Tao
: Kewei real estate
Position: Broker
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Diary [9 November 2011 … diary [20 September 2011 … home in the search room, welcome …

admin — Fri, 04 May 2012 17:17:23 +0000

September 20, 2011
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Name: Wu Tsung
Unit: Nanchang Central Property Consultants Limited
Position: Senior career counselor
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Kunming 2011 real estate trend

admin — Fri, 04 May 2012 17:17:15 +0000

December 23, 2010
Over time, housing prices continue to rise, a lot of the people is to catch up.
With the development of Kunming big step, Kunming, prices still rising, Kunming, South Asia, the door will lead to a lot of district, so seize the time to buy a house. We can find me: I the mailbox tandehua188@163.comhttp of Naruhito property Xiaotan Tel 13888352191 QQ531446792
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admin — Wed, 18 Apr 2012 17:04:34 +0000

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admin — Mon, 09 Apr 2012 08:11:56 +0000

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cultural trapped in long-term

admin — Mon, 09 Apr 2012 08:11:48 +0000

Of course, we is not to say that the expedition did not play
objectively progressive role should be recognized that the
establishment of the Mongolian empire across Europe and Asia to the
East-West Economic and cultural exchanges, to the conditions. Not
only all kinds of goods, set in the Mongolian Khan tribunal, the
commercial prosperity; to compass, movable – type, gunpowder, paper
of the West, medicine, calendar, system of artillery, machine-made
goods in the East . Promote the development of each other
cultures. It should be noted that the access to such exchanges very
short time, the Mongol Empire the facts split into four khanates,
each other, a brutal war, and restore the original. the
left over from history, it can only Do not see it, is unfair. Do
not need a list of facts, I think everyone will agree with the
assertion that Marx made a large number of facts: the Mongol tribes
in the Sahara Hill, Bukhara, Samarkand, Baer Ha and other
prosperity of the city, the performance of the barbaric acts of art
The magnificent library, excellent agriculture, palaces and mosques
are destroyed. They cruelly oppressed, Under the rule of various
ethnic groups, economic and cultural trapped in long-term
decline.

online or through local stores

admin — Mon, 09 Apr 2012 08:11:43 +0000

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Jane Zhang “one emotional” wounding performances like “Beauty Fish

admin — Thu, 29 Mar 2012 19:45:18 +0000

November 12, 2011 Jane Zhang,
last night dancing and singing is superb, continuously for the home audience sang the first of more than 30 familiar songs, Christian Louboutin is not only a new interpretation of the new album “Change” tracks, a cover of SarahMclachlan “angel” and other songs. “When the rhythm slowly to relieve down, Jane Zhang turned gorgeous blue elf princesses, bring the film” Painted Skin “theme song” Painted Heart “. She told reporters: “The injury is just an episode, will not affect my performance. Rehearsal in Beijing, Christian Louboutin Outlet, her right foot, severe sprains, bruises, has not yet been dissipated; rehearsal in Shanghai, her left foot, right hand accidentally injured. Last night, not fully recovered from Jane swore bandage play, as if reluctantly dance “Beauty fish”. More than 30 songs, singing and dancing, Zhang Liang Ying Tan words: “Next year I will not open the concert of Christian Louboutin Sale So this time I want to use 200% of the energy to sing two years, well, big deal to fight. Link in the encore, Jane Zhang once again emotionally sing “Ilovethiscity tell the love of home this piece of earth. This concert will be unforgettable in the night of the century bachelor liar Day “, with the injured right foot, Jane Zhang (microblogging) for the home fans a feast of the eyes and ears. Cheap, Christian Louboutin, last night, an opening, Jane Zhang embodiment of the future women warriors, wearing high heels to metallic women armor stunning debut, the dynamic mechanical Dance like appearance opened the prelude to the whole concert. Jane Zhang on stage radiant, innocent people is difficult to see that she is wounded performances. On the stage, she had to be confined to a wheelchair. http://www.christianlouboutin-highheels.com/

[Popular] Sichuan temporarily the PLAY in January 2010, Paul Ling Chen Edison Zhao Chenhao world thermal Brothers Audio Civic Die Tour Xi market open to do Qian received.

admin — Thu, 29 Mar 2012 19:45:14 +0000

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