How Does Cast Steel Gate Valve Supplie In China Work?

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The gate valve is a gate for opening and closing. The movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate valve is sealed by the contact between the valve seat and the gate plate. Usually the sealing surface will be welded with metal materials to increase wear resistance, such as 1Cr13, STL6, stainless steel, etc. The gate has a rigid gate and an elastic gate. According to the difference of the gate, the gate valve is divided into a rigid gate valve and an elastic gate valve.

Cast Iron Gate Valve

The opening and closing part of the gate valve is a gate. The movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used model gate valve form a wedge. The wedge angle varies with valve parameters, usually 5°, and 2°52' when the medium temperature is not high. The gate of the wedge gate valve can be made into a whole, called a rigid gate; it can also be made into a gate that can produce slight deformation to improve its manufacturability and make up for the deviation of the sealing surface angle during the processing. The plate is called an elastic gate. When the gate valve is closed, the sealing surface can be sealed only by medium pressure, that is, relying on the medium pressure to press the sealing surface of the gate to the valve seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. Most gate valves adopt forced sealing, that is, when the valve is closed, the gate must be forced against the seat by external force to ensure the sealing performance of the sealing surface. The gate valve of the gate valve moves linearly with the valve stem, which is called the lifting stem gate valve, also called the rising stem gate valve. Usually there is a trapezoidal thread on the lifting rod, through the nut on the top of the valve and the guide groove on the valve body, the rotary motion is changed into linear motion, that is, the operating torque is turned into operating thrust. When the valve is opened, when the lifting height of the gate is equal to 1:1 times the valve diameter, the fluid passage is completely unblocked, but this position cannot be monitored during operation. In actual use, the apex of the valve stem is used as a mark, that is, the position where it cannot be opened, as its fully open position. In order to take into account the locking phenomenon due to temperature changes, it is usually opened to the apex position, and then back 1/2-1 circle, as the position of the fully open valve. Therefore, the fully open position of the valve is determined by the position of the gate, that is, the stroke. In some gate valves, the stem nut is set on the gate, and the rotation of the handwheel drives the rotation of the valve stem to lift the gate. This kind of valve is called a rotating stem gate valve, or a dark stem gate valve.

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Cast steel wedge gate valve are on the most common types of valves on the market, which is widely used in various industries, for water, natural gas, oil, petro and petrochemical plants. It is a liner-motion valve that uses a typically flat closure element perpendicular to the process flow, which slides into the flow stream to provide shut off, to do an on-off function for the liquid and gas services.

Design & Testing International Standard:

Design Standard : API 600, ASME B16.34

Inspection & Testing Standard : API 598

Flange To Flange Length : ANSI B 16.10

End Connection : Flanged End to ANSI B 16.5, Butt Weld ends, Stock Weld ends.

Manufacturer Size and Pressure Range:

NPS 2” to 48 ” (for ANSI Class 150LB)

NPS 2” to 40” (for ANSI Class 300LB)

NPS 2” to 24” (for ANSI Class 600LB)

NPS 2” to 20” (for ANSI Class 900LB)

NPS 2” to 16” (for ANSI Class 1500LB)

NPS 2” to 12” (for ANSI Class 2500LB)

Construction Body: Outside screw and yoke(OS&Y)

Bonnet/Cover type: Bolted Bonnet (BB) / Pressurized Seal Bonnet (PSB)

Seat Type: Hardseal Metal Type

Stem Type: Ring Stem

Gasket: Spiral Wound Gasket

Flow Directional: Uni-Directional

Service Medium: Natural Gas, Oil, Water, gas, etc

Fugitive Emission: ISO 15848

Valve Operation: Handwheel / Worm-Gear / Motor Actuator

MOC (Bill of Material – BOM) :

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Body &Bonnet: ASTM A 216 GR. WCB (Carbon steel)

: ASTM A352 LCB / LCC (Low temp. carbon steel)

: ASTM A217 WC1/ WC6/ WC9/ C5 (High temp. carbon steel)

: ASTM A 351 GR. CF 8 / CF 8M (SS 304 / SS 316) (Stainless Steel)

: ASTM A 351 GR. CF 3 / CF 3M (SS 304L / SS 316L) (Stainless Steel)

: ASTM A351 Gr. CF8C

: ASTM A890 4A / 5A/ 6A (Duplex Stainless Steel)

Disc : ASTM A216 GR.WCB /

: ASTM A352 LCB / LCC

: ASTM A217 WC1/ WC6/ WC9/ C5

: ASTM A 351 GR. CF 8 / CF 8M (SS 304 / SS 316)

: ASTM A 351 GR. CF 3 / CF 3M (SS 304L / SS 316L)

: ASTM A351 Gr. CF8C

: ASTM A890 4A / 5A/ 6A

Stem : ASTM A182 F6a

:ASTM A182 F304 / F316 / F304L / F316L

:17/4 PH

: ASTM A182 F51/ F53/ F55

Seat Ring: : ASTM A105N / A105N

: ASTM A 182 F304 / F316

: ASTM A 182 F304L / F316L

: ASTM A 182 F347 : ASTM A182 F51/ F53 /F55

Gasket: SS Spiral Wound+ Graphite, or SS Spiral Wound + PTFE, or Reinforced PTFE

Gland Packing : Flexible Graphite /PTFE

What is a reduced bore ball valve?

A reduced bore ball valve is a type of ball valve that the valve’s inside bore diameter is smaller than the pipe diameter, while the valve’s flange dimension is still match with the pipe diameter. The working requirement is that is a turbulence and fluid flow rate are not major concerns and where buildup of particles is not likely to occur, to avoid valve blockage.

With a smaller insider diameter, the valve housing and ball size are also smaller, so that the reduce bore ball valve occupy a smaller volume, which make it consumes a smaller space during installation. What’s more, the material for a smaller housing and ball charge a lower material cost, to affects the final products cost, to reduce the whole cost of the pipeline system.

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