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


公称通径(mm)
80~1600
公称压力(MPa)
0.6
1.0
1.6
2.5
4.0
试验压力
强度试验
0.9
1.5
2.4
3.75
6.0
密封试验
0.66
1.1
1.76
2.75
4.4
气压密封试验
0.6
适用介质
水、蒸汽、煤气
适用温度(℃)
软密封:≤80℃;C碳素钢-29-425℃; I合金钢-29-530℃;P 铬镍钛钢与R铬镍钼钛钢-196-600℃


Material of main parts


1
阀体
WCB
12
端盖
WCB
2
阀瓣
2Cr13/1Cr18NiTi
13
阀轴
1Cr18NiTi
3
阀杆
2Cr13/1Cr18NiTi
14
4
导向套
2Cr13/1Cr18NiTi
15
液压源接管
铜管
5
填料
柔性石墨
16
2位5通电磁阀
组合件
6
填料压盖
25
17
关阀液压管
铜管
7
支架
WCB
18
开阀液压管
铜管
8
指示盘
25
19
9
阀杆
2Cr13/1Cr18NiTi
20
10
助关液压缸
组合件
21
信号反馈装置
组合件
11
22
信号反馈装置
组合件



23
阀体
WCB
33
助关液压缸
组合件
24
阀瓣
2Cr13/1Cr18NiTi
34
关阀液压管
铜管
25
螺栓+螺母
标准件
35
开阀液压管
铜管
26
阀杆
2Cr13/1Cr18NiTi
36
27
填料
柔性石墨
37
28
填料压盖
25
38
信号反馈装置
组合件
29
支架
WCB
39
信号反馈装置
组合件
30
指示盘
25
40
2位5通电磁阀
组合件
31
液压缸连接杆
2Cr13/1Cr18NiTi
41
液压源接管
铜管
32
42


阀门使用性能要求 
1.该液动式抽汽止回阀采用独立的逆止阀和辅助液动关闭装置相结合的结构型式,当汽轮机开始工作时,控制系统装置中的液压源通过电磁换向阀进入助关液压缸的下腔,推动助关液压缸活塞向上移动,压缩弹簧并使弹簧蓄能,阀板在管路介质的推动下开启。当系统故障时,管路介质压力降底,阀板在自身重力的作用下关闭,此时控制系统液压源电磁换向阀接受信号液压源换向,使液压源进入助关液压缸的上腔,与弹簧一起推动液压缸活塞向下移动,帮助阀板以快的速度关闭,阀门在阀板关闭后从辅助动力装置获得一定锁闭阀板力,以防管路系统蒸汽和冷嶷水倒流,保护汽轮机等主要设备。
2.阀门执行机构采用液压式,一旦电磁换向阀接受信号液压源换向,执行机构弹簧和电磁换向阀液压源能使阀门迅速关闭,关闭时间0.5~1秒。
3.辅助动力装置的安装不影响阀门的可靠性,一旦辅助动力装置故障,阀门仍可利用阀碟和阀板自重和反向汽流作用下自行关闭。
4.阀门设置开启和关闭位置开关,并能远传到运行集控室便于运行人员及时了解阀门所处状态,还设置就地机械阀位指示。
5. 阀门液动执行机构在断电、断信号不断液压源时处于开启状态。阀门液动执行机构在通电、通信号通液压源时处于关闭状态。
6.控制箱设就地和远程控制,当选择就地控制时,操作开阀与关阀按扭可控制阀门开闭,或在接收到故障信号时或蜂鸣报警响阀门关闭,在系统故障恢复正常后需手动操作阀门开闭。当选择远程控制时如需开闭阀门当控制箱接收到开闭信号或故障信号后阀门自动开闭,无需人工操作。
7.供货范围:液压式的带液压站执行机构(除使用单位自己有液压源)、二位四通电磁换向阀。
安装和保养
1.在安装前要清洗阀门内脏的污垢与灰尘,以确保使用效果。
2.本阀安装方向依介质流向与阀体箭头一致,法兰尺寸JB/T79-94标准。
3.管道进行强度试验时,应将阀门打开。
4.本厂产品出厂前经严格试验合格,请勿随意拧动产品各部位的部件。
5.阀门如长时间库存时,应注意保存在干燥的仓库内,并定期做好防锈工作。
调试
连接电磁换向阀和控制箱的11、12接线端口电源,连接行程开关和控制箱3、1、1、5的电源,连接油路快的接口(P口为进油口T口为回油口),通入电磁控制电源N、L(AC220/DC24V订货时注明)液压源0.5-0.8MPa即可控制阀门开启或关闭。如出现开闭与控制箱指示灯不吻合,调换信号反馈装置开关两端控制线即可。
注:液压流量要求每分钟不小于40000毫升
线路图
故障及排除方法


可能发生的故障
原因
排除方法
密封面泄漏
1.阀瓣密封面夹有杂物
2.阀瓣关闭不到位
3.密封面刮伤
1.清理杂质.清洗阀门内腔
2.调整连接件(图中8、9处)
3.研磨密封面
阀门两端面泄漏
1.两侧密封垫片失效
2.管法兰压紧力不够或压紧不均匀
1.更换密封垫片
2.压紧法兰螺栓
填料处泄漏
1.填料压盖螺母松动
2.填料损坏
1.拧紧压盖螺母(以填料不泄漏为准)
2.更换填料
阀门不开闭
1控制线路故障
2电磁阀线圈烧坏
3.液压源故障
1.检查控制线路
2.更换线圈
3.检查液压源


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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