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Hydraulic quick closing check valve

Hydraulic quick closing check valve
  • sell:021-32051999
  • sell:021-32050777
  • fax:021-66099555

Details

  • Product Introduction
  • Service Promise
  • Ordering Process

Hydraulic exhaust check valve is installed in the exhaust horizontal pipeline from the middle and low pressure steam guide pipe of steam turbine. It is mainly to prevent the steam in the exhaust pipeline from backfilling in case of accident and cause turbine overspeed.


Structural characteristics


1. The valve plate adopts large oblique angle to shorten the opening and closing stroke, hydraulic (gas) closing aid to realize quick opening and closing, three-dimensional eccentric sealing structure, opening and sealing is separated, closing contact is sealed, opening and closing is light and flexible. (less than DN250 using cut-off mode)


2, the valve plate is assisted to close the thrust to achieve the purpose of cut-off and check.


3, fast closing time can reach 0.5~ 1 seconds, emergency cut-off is safe and reliable.


technical requirement


1. hydraulic source interface: RC1/2


2. hydraulic cylinder operating pressure: 0.5-0.8 MPa,


3. emergency cut off time; 0.5-1 seconds.


4. connecting flange: JB/T79-94 GB/9113.2000


5. structure length: GB 12221-89


6. supply voltage: AC220-DC24V (marked when ordering)


Model compilation

Main technical parameters


公稱通徑(mm)
80~1600
公稱壓力(MPa)
0.6
1.0
1.6
2.5
4.0
試驗壓力
強度試驗
0.9
1.5
2.4
3.75
6.0
密封試驗
0.66
1.1
1.76
2.75
4.4
氣壓密封試驗
0.6
適用介質
水、蒸汽、煤氣
適用溫度(℃)
軟密封:≤80℃;C碳素鋼-29-425℃; I合金鋼-29-530℃;P 鉻鎳鈦鋼與R鉻鎳鉬鈦鋼-196-600℃


Material of main parts


1
閥體
WCB
12
端蓋
WCB
2
閥瓣
2Cr13/1Cr18NiTi
13
閥軸
1Cr18NiTi
3
閥桿
2Cr13/1Cr18NiTi
14
4
導向套
2Cr13/1Cr18NiTi
15
液壓源接管
銅管
5
填料
柔性石墨
16
2位5通電磁閥
組合件
6
填料壓蓋
25
17
關閥液壓管
銅管
7
支架
WCB
18
開閥液壓管
銅管
8
指示盤
25
19
9
閥桿
2Cr13/1Cr18NiTi
20
10
助關液壓缸
組合件
21
信號反饋裝置
組合件
11
22
信號反饋裝置
組合件



23
閥體
WCB
33
助關液壓缸
組合件
24
閥瓣
2Cr13/1Cr18NiTi
34
關閥液壓管
銅管
25
螺栓+螺母
標準件
35
開閥液壓管
銅管
26
閥桿
2Cr13/1Cr18NiTi
36
27
填料
柔性石墨
37
28
填料壓蓋
25
38
信號反饋裝置
組合件
29
支架
WCB
39
信號反饋裝置
組合件
30
指示盤
25
40
2位5通電磁閥
組合件
31
液壓缸連接桿
2Cr13/1Cr18NiTi
41
液壓源接管
銅管
32
42


閥門使用性能要求 
1.該液動式抽汽止回閥采用獨立的逆止閥和輔助液動關閉裝置相結合的結構型式,當汽輪機開始工作時,控制系統裝置中的液壓源通過電磁換向閥進入助關液壓缸的下腔,推動助關液壓缸活塞向上移動,壓縮彈簧并使彈簧蓄能,閥板在管路介質的推動下開啟。當系統故障時,管路介質壓力降底,閥板在自身重力的作用下關閉,此時控制系統液壓源電磁換向閥接受信號液壓源換向,使液壓源進入助關液壓缸的上腔,與彈簧一起推動液壓缸活塞向下移動,幫助閥板以快的速度關閉,閥門在閥板關閉后從輔助動力裝置獲得一定鎖閉閥板力,以防管路系統蒸汽和冷嶷水倒流,保護汽輪機等主要設備。
2.閥門執行機構采用液壓式,一旦電磁換向閥接受信號液壓源換向,執行機構彈簧和電磁換向閥液壓源能使閥門迅速關閉,關閉時間0.5~1秒。
3.輔助動力裝置的安裝不影響閥門的可靠性,一旦輔助動力裝置故障,閥門仍可利用閥碟和閥板自重和反向汽流作用下自行關閉。
4.閥門設置開啟和關閉位置開關,并能遠傳到運行集控室便于運行人員及時了解閥門所處狀態,還設置就地機械閥位指示。
5. 閥門液動執行機構在斷電、斷信號不斷液壓源時處于開啟狀態。閥門液動執行機構在通電、通信號通液壓源時處于關閉狀態。
6.控制箱設就地和遠程控制,當選擇就地控制時,操作開閥與關閥按扭可控制閥門開閉,或在接收到故障信號時或蜂鳴報警響閥門關閉,在系統故障恢復正常后需手動操作閥門開閉。當選擇遠程控制時如需開閉閥門當控制箱接收到開閉信號或故障信號后閥門自動開閉,無需人工操作。
7.供貨范圍:液壓式的帶液壓站執行機構(除使用單位自己有液壓源)、二位四通電磁換向閥。
安裝和保養
1.在安裝前要清洗閥門內臟的污垢與灰塵,以確保使用效果。
2.本閥安裝方向依介質流向與閥體箭頭一致,法蘭尺寸JB/T79-94標準。
3.管道進行強度試驗時,應將閥門打開。
4.本廠產品出廠前經嚴格試驗合格,請勿隨意擰動產品各部位的部件。
5.閥門如長時間庫存時,應注意保存在干燥的倉庫內,并定期做好防銹工作。
調試
連接電磁換向閥和控制箱的11、12接線端口電源,連接行程開關和控制箱3、1、1、5的電源,連接油路快的接口(P口為進油口T口為回油口),通入電磁控制電源N、L(AC220/DC24V訂貨時注明)液壓源0.5-0.8MPa即可控制閥門開啟或關閉。如出現開閉與控制箱指示燈不吻合,調換信號反饋裝置開關兩端控制線即可。
注:液壓流量要求每分鐘不小于40000毫升
線路圖
故障及排除方法


可能發生的故障
原因
排除方法
密封面泄漏
1.閥瓣密封面夾有雜物
2.閥瓣關閉不到位
3.密封面刮傷
1.清理雜質.清洗閥門內腔
2.調整連接件(圖中8、9處)
3.研磨密封面
閥門兩端面泄漏
1.兩側密封墊片失效
2.管法蘭壓緊力不夠或壓緊不均勻
1.更換密封墊片
2.壓緊法蘭螺栓
填料處泄漏
1.填料壓蓋螺母松動
2.填料損壞
1.擰緊壓蓋螺母(以填料不泄漏為準)
2.更換填料
閥門不開閉
1控制線路故障
2電磁閥線圈燒壞
3.液壓源故障
1.檢查控制線路
2.更換線圈
3.檢查液壓源


The best quality, first-class service Qigao creates more value for you!

"Qigao Valve" expects to continuously improve service quality and strive for excellence. "Sincere service" is the eternal theme of "Qigao". "Qigao" strictly followsIS09001-2000 Quality system certification requirements, strict quality control, responsibility to people, to ensure the healthy operation of production, sales and service. Strengthen communication with users and provide quality products to our customers with perfection and perfect service. Hereby our factory makes the following commitments:

Product Standards:

Products in strict accordance with ChinaGB、HG Standard and USAPISuch as standard design, manufacturing, acceptance. The hardness of the sealing surface meets the requirements of the state and the width exceeds the national standard.

pre-sale service:

Product introduction, technical exchange, non-standard product design, troubleshooting。

Sale service:

A trustworthy contract guarantees timely delivery and keeps in touch with customers. For special or duplicate products, our factory arranges technicians to use and troubleshoot the products for users.

After sales service:

1、"Qigao" brand product quality period is from the factory12In the month, the implementation of the "three guarantees" service (return, replacement, warranty).

2、During the use of our products, our factory regularly organizes technical and quality inspection personnel to visit and consult users for feedback on product quality, usage status and improvement opinions, so as to further improve product quality.

3、Respond quickly to the quality of user complaints, after-sales service personnel rushed to the scene in 24-36 hours (48 hours outside the province).

4、For after-sales service, users are required to fill out the quality feedback information form after the service and make an appraisal opinion in order to improve the service quality of Qigao.

1、If the customer has special requirements for the product, the following instructions must be provided in the order contract.:

a、Structure length;

b、Connection Type;

c、Nominal diameter, full diameter, reduced diameter, pipe size;

d、Operating medium and temperature, pressure range;

e、Tests, inspection standards and other requirements

2、The factory can configure various types of driving devices according to customer's specific requirements.。

3、If the type and model of the valve are determined by the customer, the customer shall correctly state the meaning and requirements of the model and sign the contract under the condition that the supplier and the buyer understand each other.

4、For futures and order customers, please call us in advance to tell the required valve model, specification, quantity, delivery time and location, and timely transfer to the factory account according to the total 30% deposit or full payment. The rest of the payment is pending. Import before shipment to arrange delivery in time.

 

Order Process:

1、Customer purchase list fax to021-33872143,Or call us 021-33872141

2、Receive customer purchase list, provide valve model selection and quotation (price list)。

3、Specific agreement: delivery date, special requirements, etc.。

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1、If the customer has special requirements for the product, the following instructions must be provided in the order contract.:

a、Structure length;

b、Connection Type;

c、Nominal diameter, full diameter, reduced diameter, pipe size;

d、Operating medium and temperature, pressure range;

e、Tests, inspection standards and other requirements

2、The factory can configure various types of driving devices according to customer's specific requirements.。

3、If the type and model of the valve are determined by the customer, the customer shall correctly state the meaning and requirements of the model and sign the contract under the condition that the supplier and the buyer understand each other.

4、For futures and order customers, please call us first to tell the required valve model, specifications, quantity, delivery time and location, and press the total30%The deposit or full payment will be remitted to our factory account in time., The rest of the payment will be remitted before shipment to arrange delivery in time.。

Sale service:

Trustworthy contract, guarantee timely delivery, keep in touch with customers at any time。

For special or duplicate products, our factory arranges technicians to use and troubleshoot the products for users.

After sales service:

1、"Qigao" product quality period is from the factory12Month, practiceThree packsService (return, replacement, warranty)。

2、During the use of our products, our factory regularly organizes technical and quality inspection personnel to visit and consult users for feedback on product quality, usage status and improvement opinions.,
In order to further improve product quality。

3、Respond quickly to the quality of user complaints, after-sales service personnel24-36Hours (outside the province48Hour) rushed to the scene。

4、For after-sales service, the user is required to fill out the quality feedback information form after the service and make an appraisal opinion in order to improve the service quality of “Qigao”.。

statement

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