Stainless Steel Globe Valve

Product Description

Stainless steel globe valve is a kind of globe valve, and it can also be called ss globe valve. It has relatively high requirements on the material of the valve body. Generally, there are several material options such as 301, 304, and 316. It is widely used in chemical industry, ships, medicine, food machinery, etc. industry. Stainless steel globe valve is divided into manual stainless steel globe valve, pneumatic stainless steel globe valve, electric stainless steel globe valve.

Stainless steel shut off valve, also called stainless steel shut off valve, is the most widely used valve. Easy to manufacture and easy to maintain, not only suitable for medium and low pressure, but also suitable for high pressure.

The working principle

The closing principle of the globe valve is to rely on the pressure of the valve stem to make the sealing surface of the valve disc and the sealing surface of the valve seat closely fit to prevent the flow of the medium.

The globe valve only allows the medium to flow in one direction, and has directionality during installation. The structural length of the globe valve is longer than that of the gate valve, and the fluid resistance is large, and the sealing reliability is not strong during long-term operation.

Features

(1) The structure is simpler than that of the gate valve, and the manufacture and maintenance are more convenient.

(2) The sealing surface is not easy to be worn and scratched, and the sealing performance is good. There is no relative sliding between the valve disc and the sealing surface of the valve body when opening and closing, so the wear and abrasion are not serious, the sealing performance is good, and the service life is long.

(3) When opening and closing, the valve flap travel is small, so the height of the globe valve is smaller than that of the gate valve, but the structural length is longer than that of the gate valve.

(4) The opening and closing torque is large, the opening and closing is laborious, and the opening and closing time is long.

(5) The fluid resistance is large, because the medium channel in the valve body is tortuous, the fluid resistance is large, and the power consumption is large.

(6) The flow direction of the medium When the nominal pressure PN≤16MPa, the forward flow is generally adopted, and the medium flows upward from the bottom of the valve disc; when the nominal pressure PN≥20MPa, the countercurrent flow is generally adopted, and the medium flows downward from the top of the valve disc. to increase seal performance. When in use, the globe valve medium can only flow in one direction and cannot change the flow direction.

(7) The valve disc is often eroded when fully open.

Classification

1. According to the channel direction of the globe valve, it is divided into:

1) Straight-through globe valve

2) DC globe valve

3) Angle globe valve

4) Plunger globe valve

2. According to the position of the thread on the stem of the globe valve, it can be divided into:

1) Upper threaded stem globe valve

2) Lower threaded stem globe valve

Advantages

1. Simple structure, easy to manufacture and maintain.

2. The working stroke is small and the opening and closing time is short.

3. Good sealing performance, small friction between sealing surfaces and long service life.

Disadvantages

1. The fluid resistance is large, and the force required for opening and closing is large.

2. It is not suitable for medium with particles, high viscosity and easy coking.

3. Poor adjustment performance.

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