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API gate valve

Features and advantages

Valve bearing parts are made of precision casting process. The surface quality handwheel is made of malleable cast iron, and the shape is matched with handle to increase friction force,easy to open. There are obvious "on" and "off" signs.

The stem nut is made of high nickel ductile iron, and the "T" thread is coupled with the stem to transmit torque.

The valve cover is provided with an oil cup, can be regularly added solid lubricants, maintain easily open and close.

Packing gland and press sleeve design to ensure the concentricity of the valve stem. Reasonable stuffing box design, to ensure that the valve is no leakage, comply with environmental protection requirements.

The valve cover is provided with an upper sealing ring, which conforms to the American Petroleum Institute API standard.

The middle flange connecting bolts of the valve adopt double headed bolts, which is convenient for maintenance and disassembly.

The stem head is integrally forged and is connected with the disc through the "T" groove to ensure the strength.

The castings below DN250 are precision casting. Each batch of castings is marked with furnace number, which is easy to track.

Simple torque transfer structure of API gate valve

  The handwheel passes the torque to the stem through the stem nut. The stem is forged by A182F6 (1Cr13) and quenched and tempered, with a hardness of HB220 to 250.
In order to reduce the loss of force in the transmission process, stem nut selection of high nickel ductile iron A439GR.D2 or copper alloy (high nickel ductile iron has a certain degree of self lubrication), hardness is about HB50 smaller than the stem.

  Large diameter and high pressure valve in the valve stem nut, and thrust bearing with oil cup structure, regularly adding solid grease, maintain lubrication to ensure the valve is with light torque.



Design reasonable anti leakage packing box

  Combination valve use flexible graphite packing and braided graphite, which has good sealing performance and has a certain strength. Packing gland and packing press sleeve are split design,
The spherical combination can automatically maintain concentricity, so that the stem does not scratch when moving up and down. The packing press sleeve is provided with a ladder to prevent falling into the stuffing box. The tail of the valve stem is always above the packing and prevents the packing from being removed during movement. The stuffing box ensures that the valve has no leakage and conforms to the environmental protection requirements.


The stem head is reliably connected to the gate

  Valve stem using A182F6 (1Cr13) as a whole forged, with a strong tensile strength, to ensure that the stem will not be broken due to failure of the gate trap not available in the valve body.

  The head of the valve stem is provided with the upper sealing cover of the sealing cover of the valve cover. When the medium is special, the valve is required to be opened without any leakage.
  The connection between the stem head and the gate adopts a "T" groove structure with a certain degree of freedom, which makes the gate slide smoothly into the valve seat along the valve guide.

Replaceable valve seat Certain wear allowance

  Valve seat and valve connection is threaded connection, easy maintenance and replacement. The valve seat is firmly sealed and the cover is carefully honed and is screwed into the valve body with special tools to achieve a reliable seal.
The gate sealing surface of the valve seat sealing surface than a certain margin, and to ensure that the valve before using the valve plate sealing surface and the valve seat sealing surface of the bottom line in the bottom line of the same height,
After a certain period of time, even if the valve is worn, it will not reduce the width of the sealing surface that must be guaranteed.


Design and manufacture standard:

Design and manufactureAPI600 API6D GB12234
Flange size:ANSIB 16.5 JB/T79 GB9113
Pressure temperature:ANSSIB 16.34
●Face to face
ANSIB16.10 GB12221
Butt welding connection size :ANSIB 16.25
●Inspection and test
API598 JB/T9092

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