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Pneumatic eccentric hemisphere valve

  • [valve model]: PQ640F,PQ640H
  • [diameter specification]: DN25~DN300
  • [structural form]: Eccentric rotating ball core
  • [valve body material]: Carbon steel WCB, stainless steel 304, stainless steel 316
  • [nominal pressure]: PN10、PN16、PN25、PN40
  • [applicable temperature]: -20℃~450℃
  • [application scope]: Steam, water, oil, gas, corrosive medium
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  •  Pneumatic eccentric hemisphere valve

Product features

Pq640h pneumatic eccentric hemispherical valve has the characteristics of no friction on the switch, no easy wear of seal and small opening and closing torque. The ball body is rotated around the eccentric axis to control the pipeline medium. During the switching process, there is no friction between the sealing surface of the ball and the valve seat, which reduces the wear of the sealing parts and greatly improves the service life. Because the structure principle of pneumatic eccentric hemisphere valve is very similar to the operation form of three eccentric butterfly valve, some people call eccentric hemisphere valve is a kind of butterfly valve with spherical disc.
 Structure diagram of pneumatic eccentric hemisphere valve
 
Features of pneumatic eccentric hemisphere valve:
 
1. The ball and valve seat of pq640h pneumatic eccentric ball valve are completely separated, which eliminates the wear of sealing ring and overcomes the problem of wear between traditional ball valve seat and ball sealing surface all the time. The non-metallic elastic material is embedded in the metal seat, and the metal surface of the valve seat is well protected.
2. The V-notch of pneumatic eccentric ball valve has cutting function, which can cut off the sundries (branches, textile bags, etc.) in the medium when closing, so as to ensure the normal opening and closing of the valve.
3. 2. The hemisphere of the valve is made of bimetallic, the base metal is overlaid with different alloys, and the valve seat is also subject to corresponding surfacing. After special treatment, the sealing surface is combined with various types of anti-corrosion, wear-resistant and high-strength to meet the needs of different occasions.
4. The pneumatic eccentric rotary valve is especially suitable for mud, medium containing fiber, and medium containing tiny solid suspension. It is widely used in the pipeline of petroleum, chemical industry, papermaking, sewage treatment, etc. for switch off or flow regulation.
 
Principle description of pneumatic eccentric hemisphere valve (Figure)
 Schematic diagram of eccentric hemisphere valve
 
When the valve is fully opened, the ball and the valve seat will be completely separated, and there is a certain gap. The turning radius is divided into long radius and short radius. The tangent line of the long radius rotation track will form a θ angle with the sealing surface of the valve seat. When the valve is opened and closed, there is a gradual separation and gradual in between the hemisphere and the seat surface As a result, the mechanical wear and scratch between the valve seat and the hemisphere are reduced and the service life is improved.  

technical parameter

Nominal diameter DN25~DN300(MM)
Nominal pressure PN1.0、1.6、2.5、6.4MPa
Connection form Clamp type, flange connection
structural style Through eccentric ball valve
Driving form Compressed air 4-7bar (with manual device)
body material Carbon steel WCB, stainless steel 304, stainless steel 316 316L
Leakage Q Soft seal grade VI and hard seal grade IV
Adjustable range Total cavity type (100:1), 60% cavity type (60:1), 40% cavity type (40:1)
Flow characteristics Approximately equal percentage
control mode Switch type (two position switch off), adjustable type (positioner 4-20mA analog signal)
Form of action Single acting (spring return) normally open, normally closed; double acting (no reset) air on / off

Quotation process

Valve price:

Due to the different requirements of order quantity, packaging and delivery mode, as well as the fluctuation of valve raw material price, the valve price will be greatly different. Therefore, the price of our products is not indicated on the website. Please understand.

If you select a valve product on this website, if you need to know the price or ask for relevant technical information, please contact us. We will reply immediately, and according to your requirements, we can select the right valve products for you, so that your purchasing process is easy and pleasant.

Quotation process:

1. Please fax the name (or product model) of the valve you selected, the required order quantity, packing requirements, delivery time, your company name, location and contact information of your company to 021-36311208 Or telephone number: 021-60547555。

2. After receiving the customer's purchase list, our company will provide customers with valve quotation "price list", model selection "valve model" and technical guidance as soon as possible.

3. Special requirements, etc.

Ordering instructions

1、 If the customer has special requirements for the product, the following instructions shall be provided in the order contract:
(1) Valve body material (such as: plastic, cast steel, stainless steel...)
(2) For example, flange connection
(3) Nominal diameter, pipe size
(4) Ambient temperature and pressure range
(5) Supply voltage, air pressure
(6) Fluid properties (including nominal pressure, temperature, viscosity or acidity or alkalinity)
2、 The company configures all kinds of driving devices according to the special requirements of customers. Pneumatic control
3、 If the customer provides the determined valve type and model, the customer shall correctly explain the meaning and requirements of the valve model (for details, refer to the description of valve model preparation), and sign the contract under the condition that both parties understand and agree.
4、 After the customer tells the required valve model, specification, quantity and delivery time and place, 20% of the total amount of deposit or full payment shall be timely remitted to our company's account, and the rest shall be remitted before delivery, so as to arrange delivery in time.
5、 After confirming the purchase, our company carries on the production in strict accordance with the delivery date. According to the different types and quantities of orders, the product processing cycle is generally 3 to 30 days, and the specific delivery time is subject to the contract. Please make sure that the order is in time for you.
6、 According to the needs of customers, our company provides network distribution services, delivering goods to the branches (offices) in major cities, and providing door-to-door delivery service. After the product acceptance, our company will provide after-sales service.