J23W-160P stainless steel pressure gauge needle valve

NegotiableUpdate on 04/06

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Nature of the Manufacturer: Producers

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Overview

Product Overview: Needle valve is a type of valve that can be precisely adjusted and has a wide range of applications, such as the cutting distance for flame cutting and the knob for adjusting flame temperature. Instrument needle valve is an important component of instrument measurement pipeline system, mainly including globe valve and

Product Details

Product Introduction

Needle valve is a type of valve that can be precisely adjusted and has a wide range of applications, such as the cutting distance for flame cutting and the knob for adjusting flame temperature. Instrument needle valve is an important component of instrument measurement pipeline system, mainly including globe valve and ball valve, which is used to open or cut off pipeline passage. The valve core of a needle valve is a pointed cone that is inserted into the valve seat like a needle, hence the name.

J23H, J23W, and J23Y needle valves are a type of globe valve, also known as external thread needle valves, external thread needle valves, or external thread globe valves. They are connected by welding and connected to the valve body using external thread union. Therefore, they are also called external thread globe valves. They are a commonly used form of needle valve. During installation, the welded short pipes on both sides are welded to the pipeline, and the union on the needle valve can be turned for installation and disassembly. They are convenient, simple, economical, practical, and easy to maintain. Generally, the pressure of needle valves can reach various pressure requirements. They are a relatively useful globe valve, mainly used for opening and closing, cutting off, opening, and changing the flow direction of media in fluid pipelines. Function

Material of parts:

Part Name	Valve stem, valve cover	Valve stem and disc	J21W/J23W type filling material
J21W/J23W/23Y-16P /25P/32P/160P/64P/40P	Chromium nickel stainless steel	Chromium nickel stainless steel	Polytetrafluoroethylene, flexible graphite

J21W/J23W/J23Y-160/64/32/25/16J21W/J23W－40	20#	carbon steel

Working Principle:

When the handwheel is rotated clockwise, the valve stem is threaded to slowly press the needle valve core towards the valve seat end face, causing it to tightly seal and achieve the closing function. When the handwheel is rotated counterclockwise, the valve core slowly moves away from the valve seat, achieving the opening purpose.

Anti corrosion method:

Firstly, the anti-corrosion of the valve body mainly uses materials such as stainless steel and carbon steel. Although there is a wealth of information on corrosion prevention, it is still not easy to choose the right one because the problem of corrosion is very complex. The difficulty in choosing valve body materials also lies in not only considering corrosion issues, but also taking into account factors such as pressure and temperature resistance, economic feasibility, and ease of purchase.

Secondly, lining measures should be taken, such as lining with lead, lining with aluminum, lining with engineering plastics, lining with natural rubber, and various synthetic rubbers. If the medium conditions permit, this is actually a cost-effective method.

Again, under low pressure and temperature conditions, using non-metallic valve body materials can often effectively prevent corrosion.

In addition, the outer surface of the needle valve body is also subjected to atmospheric corrosion, and generally steel materials are protected by painting.

Installation precautions:

1) The installation position, height, and inlet/outlet direction must meet the design requirements, and the direction of medium flow should be consistent with the arrow direction marked on the valve body. The connection should be firm and tight.

2) Before installing the valve, a visual inspection must be conducted, and the valve nameplate should comply with the current national standard "General Valve Marking" GB 12220. For valves with a working pressure greater than 1.0 MPa and a shut-off function on the main pipeline, strength and tightness tests should be conducted before installation, and they can only be used after passing the tests. During the strength test, the test pressure shall be 1.5 times the nominal pressure, and the duration shall not be less than 5 minutes. The valve shell and packing shall be qualified if there is no leakage. During the tightness test, the test pressure is 1.1 times the nominal pressure; The duration of the experiment meets the requirements of GB 50243.

Selection principle:

1. Low temperature needle valves with valve covers should be selected for pipeline systems and devices for low-temperature media.

2. On the pipeline system of the catalytic cracking unit in the refining unit, a lifting rod needle valve can be selected.

3. In the equipment and pipeline systems of corrosive media such as acid and alkali in chemical systems, it is advisable to use all stainless steel needle valves made of austenitic stainless steel with polytetrafluoroethylene as the valve seat sealing ring.

4. Metal to metal sealed needle valves can be used on pipeline systems or devices for high-temperature media in metallurgical systems, power systems, petrochemical plants, and urban heating systems.

5. When flow regulation is required, a worm gear transmission, pneumatic or electric regulating needle valve with a V-shaped opening can be selected. 6. For the main pipelines of oil and natural gas transportation, those that need to be cleaned and buried underground, needle valves with full bore and fully welded structures should be selected; For ball valves buried on the ground, choose full bore welded connections or flange connections.

7. Flange connected needle valves are used for the transportation pipelines and storage equipment of finished oil products.

8. On the pipelines of urban gas and natural gas, needle valves with flange connections and internal thread connections are selected.

9. In the oxygen pipeline system of the metallurgical system, it is advisable to use needle valves that have undergone strict degreasing treatment and are connected by flanges.