Eccentric hemispherical valve

Product description

PQ94F/Y/H-6~100C,P,R

Product use

Q347 PN16 and PN25 eccentric hemispherical valves use eccentric valve body, eccentric ball and valve seat. When the valve stem rotates, it will be automatically centered on the common track. The closer it is closed, the tighter it is in the closing process, and the good sealing purpose is fully achieved. The ball of the valve is completely separated from the valve seat, which eliminates the wear of the sealing ring and overcomes the problem that the traditional ball valve seat and the sealing surface of the ball are always worn. The non-metallic elastic material is embedded in the metal seat, and the metal surface of the valve seat is well protected. This product is especially suitable for steel industry, aluminum industry, fiber, micro solid particles, pulp, coal ash, petroleum gas and other media.

Product features

1. The structure adopts the eccentric clamping principle to achieve the purpose of locking, adjusting and closing through the transmission mechanism. The sealing pair is a metal surface ring with hard surface contact seal. When the double eccentric structure is opened, the valve core is located in the ball storage chamber, the flow section is large, and the valve core is not scoured when it is closed. At the beginning, the spherical surface of the valve core is gradually along the valve seat to effectively remove scaling obstacles, Achieve reliable sealing. It is especially effective for mixed flow transportation of two-phase mixed flow and easy scaling and solid precipitation.

2. The hemisphere of the valve is made of bimetal. Different alloys are overlaid on the base metal. The valve seat is also overlaid accordingly. After special treatment, the sealing surface is composed of various types such as anti-corrosion, wear resistance and high strength to meet the needs of different occasions.

3. The sealing is tight, and the transmission of harmful gas can reach zero leakage.

4. The valve core of the sealing pair is reserved with compensation. When the valve seat is worn, it rotates a little when it is closed, which can seal reliably and prolong the service life. In addition, the user can screw off the compression nut, and the valve seat can still be used after adjustment or replacement, so as to avoid the disadvantage of integration and scrapping after the valve seal fails.

The selection of bimetallic sealing pairs with different alloy (or combined ball) for surfacing can be used for working conditions with wear resistance, corrosion resistance, high temperature resistance and strict sealing requirements:

1. General purpose valve: Specification and model dn40-1600. It is suitable for occasions with strict requirements such as sewage treatment, pulp, urban heating, etc.

2. Special valve for petrochemical industry: Specification dn40-1600. It is suitable for crude oil, heavy oil and other oil products, weak corrosion and two-phase mixed flow media in chemical industry.

3. Special gas valve: Specification dn40-1600. It is applicable to the transportation control of gas, natural gas and liquefied gas

4. Special valve for slurry: Specification dn40-1600. It is suitable for industrial pipeline transportation with crystallization or scaling in liquid and solid two-phase mixed flow or liquid transportation.

5. Special valve for pulverized coal ash: Specification dn40-1600. It is applicable to the control of power plant, hydraulic slag removal or gaseous transmission pipeline.

Executive standard

Design standard: gb12237 I 89

Flange connection: GB / t17241.6 I 1998, GB / t9115 (steel)

Structure length: gb12221 I 89

Material of main parts

Name material

Valve body QT450, WCB, ZG20CrMo, zg1cr18ni9ti

Valve shaft 2Cr13, 1Cr13

Valve disc alloy nitrided steel, nitrided stainless steel, wear-resistant steel

Valve seat alloy nitrided steel, nitrided stainless steel, wear-resistant steel

Bearing aluminum bronze, Fz-1 composite

Filler PTFE, flexible graphite

Main performance parameters