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Z40Y-300LB American standard gate valve


Brief introduction of Z40Y-300LB American standard gate valve
The opening and closing parts of the gate valve are gates. The movement direction of the gates is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted and throttled. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used gate valves form a wedge. The wedge angle varies with the valve parameters, usually 50.
Z40Y-300LB American standard gate valve details
The opening and closing part of the gate valve is a gate. The movement direction of the gate is perpendicular to the fluid direction.
American standard gate valve

The valve can only be fully opened and fully closed, and cannot be adjusted and throttled. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used gate valves form a wedge shape, and the wedge angle varies with the valve parameters, usually 50, 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 a small amount of deformation to improve its processability and make up for the deviation of the sealing surface angle during processing. The plate is called a spring gate.

The type of gate valve can be divided into wedge gate valve and parallel gate valve according to the configuration of the sealing surface. Wedge gate valve can be divided into: single gate type, double gate type and elastic gate type; parallel gate type gate valve can be divided It is single-disc type and double-disc type. According to the thread position of the valve stem, it can be divided into two types: bright stem gate valve and dark stem gate valve.

When the gate valve is closed, the sealing surface can be sealed only by the pressure of the medium, that is, the sealing surface of the gate is pressed against the valve seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. Most gate valves are forcibly sealed, that is, when the valve is closed, the gate is forced to be pressed against the valve seat by external force to ensure the tightness of the sealing surface.

The gate of the gate valve moves linearly with the valve stem, which is called a lift lever gate valve (also known as an open lever gate valve). Usually there is a trapezoidal thread on the lifting rod, and the rotary motion is changed to linear motion through the nut on the top of the valve and the guide groove on the valve body, that is, the operating torque is changed to the operating thrust.

When the valve is opened, when the lift height of the gate is equal to 1: 1 of the valve diameter, the fluid channel is completely clear, 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 consider the lock-up phenomenon due to temperature changes, it is usually opened to the top position, and then back to 1 / 2-1 turn, as the position of the fully open valve. Therefore, the fully open position of the valve is determined according to the position of the gate (ie, stroke>). Stainless steel gate valves, forged steel gate valves, flange gate valves, flange ball valves, and two-piece ball valves. On the other hand, the rotation of the handwheel drives the valve stem to rotate, and the gate is lifted. This valve is called a rotary lever gate valve or a concealed lever gate valve.

Advantage one, the gate valve has the following advantages:

The fluid resistance is small, and the sealing surface is less brushed and eroded by the medium.

Less effort to open and close.

The medium flow direction is not restricted, does not disturb the flow, does not reduce the pressure.

Simple shape, short structure length, good manufacturing process and wide application range.

The disadvantages of gate valves are as follows:

It is easy to cause erosion and abrasion between the sealing surfaces, making maintenance difficult.

The external dimensions are relatively large, a certain amount of space is required for opening, and the opening and closing time is long.

Types of brakes
Wedge gate valve and parallel gate valve can be divided according to sealing surface configuration. Wedge gate valve can be divided into: single gate type, double gate type and elastic gate type; parallel gate type gate valve can be divided into single gate Plate type and double gate type. According to the thread position of the valve stem, it can be divided into two types: bright stem gate valve and dark stem gate valve.

The installation and maintenance of gate valve should pay attention to the following matters:

Handwheels, handles and transmission mechanisms are not allowed for lifting, and collision is strictly prohibited.

The double-gate gate valve should be installed vertically (that is, the valve stem is in the vertical position and the handwheel is at the top).

The gate valve with the bypass valve should be opened before opening (to balance the pressure difference between the inlet and outlet and reduce the opening force).

The gate valve with transmission mechanism shall be installed in accordance with the instructions of the product instruction manual.

If the valve is used frequently, lubricate at least once a month.

Structural features
For a long time, the general gate valve used in the market has generally suffered from water leakage or rust. Our company introduced European high-tech rubber and valve manufacturing technology to produce elastic seated gate valves, which overcomes the defects of general gate valves such as poor sealing, rust, etc. The sealing valve uses the compensation effect of a small amount of elastic deformation generated by the elastic gate to achieve a good sealing effect. The valve has the advantages of light weight, reliable sealing, good elastic memory and long service life. Can be widely used in water, sewage, construction, petroleum, chemical, food, medicine, textile, power, marine, metallurgy, energy systems and other body pipelines as regulating and shut-off devices.

The characteristics of the gate valve are light weight: the body is made of high-grade nodular cast iron, which is about 20% ~ 30% lighter than the traditional gate valve, which is easy to install and maintain.

Flat-bottom gate seat: Traditional gate valves are often deposited in grooves at the bottom of the valve due to foreign objects such as stones, wood blocks, cement, iron filings, and debris after washing the pipes. The bottom of the elastic seat sealing gate valve adopts the same flat bottom design as the water pipe machine, which is not easy to cause debris deposition and make the fluid flow unobstructed.

Integral rubber encapsulation: The gate is made of high-quality rubber for overall internal and external coating. European first-class rubber vulcanization technology enables the vulcanized gate to ensure accurate geometric dimensions, and the rubber and ductile cast sluice are firmly attached, which is not easy to fall off. Good elastic memory. water

Precision casting valve body: The valve body is precision-casting, and the precise geometric size allows the valve body to be sealed without any finishing.

The gate valve has the following advantages: 1. The fluid resistance is small, and the sealing surface is less brushed and eroded by the medium.

2. Less effort to open and close.

3. The flow direction of the medium is not restricted, does not disturb the flow and does not reduce the pressure.

4. Simple shape, short structure length, good manufacturing process and wide application range.

Disadvantages of the gate valve 1. It is easy to cause erosion and abrasion between the sealing surfaces, and it is difficult to maintain.

2. The size is large, it needs a certain space to open, and the opening and closing time is long.

3. The structure is more complicated.

The types of gates can be divided into wedge gate valves and parallel gate valves according to the configuration of the sealing surface. Wedge gate valves can be divided into: single gate, double gate and flexible gate; parallel gate valves Can be divided into single gate type and double gate type. According to the thread position of the valve stem, it can be divided into two types: bright stem gate valve and dark stem gate valve.

Installation and use of gate valves
1. Before installation, check the valve cavity, sealing surface and other parts. No dirt or sand particles are allowed to attach. 2. The bolts of each connection part must be tightened evenly. 3. Check the packing parts to be compacted to ensure the tightness of the packing. It is also necessary to ensure that the shutter can be opened flexibly. 4. Before installing the valve, the user must check the valve model, connection size and media flow direction to ensure consistency with the valve requirements. 5. When installing the valve, the user must reserve the valve drive. Necessary space; 6. Wiring of the driving device must be carried out according to the wiring diagram; 7. The gate valve must be regularly maintained, and must not be bumped or squeezed at will, so as not to affect the seal.

Air tightness test 0.5 ~ 0.7

Operating temperature

PTFE≤150 ℃ PPL≤300 ℃ Carbon fiber≤350 ℃

Applicable medium

C: water, oil, steam P: nitric acid (temperature ≤ 200 ° C) R: acetic acid (temperature ≤ 200 ° C)

Design Parameters:

Design and manufacture: GB / T12237-89

Flange connection: JB / T79-94, GB9113-2000

Structure length: GB12221-89

Nominal diameter: DN15 ~ DN150mm

Nominal pressure: PN1.6, 2.5, 4.0MP.

Gate valve routine maintenance
1. The gate valve with the bypass valve should be opened before opening (to balance the pressure difference between the inlet and outlet and reduce the opening force).
2. The gate valve with transmission mechanism should be installed in accordance with the product instruction manual.
3. If the valve is frequently opened and closed, lubricate it at least once a month.
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Yongjia Bogong Valve Co., Ltd. (operafour.com) Main Products: American standard gate valve, large caliber gate valve, electric flange gate valve, power station stop valve, Z941H electric high pressure gate valve, high pressure chromium molybdenum steel gate valve, American standard ball valve