LN82 Series Single Seat Globe Control Valve

LN82 series are LN8 series pressure imbalance structure products one of two basic bushing and seat double direction, flow capacity, good dynamic stability, porous cylinder valve core design, realizes the throttle and reasonable separation on sealing surface, sealing surface is not affected by high velocity directly erosion, sealed performance is good and reliable to prevent flash, cavitation resistance, noise reduction. The purpose of fast clean medium suitable for velocity, especially for the high pressure difference of gas control.

Product Description


Product Overview

Globe Control Valves use linear motion to move the shutoff member in and out of the seat surface. Their bodies feature a spherical cavity around the port area and are designed to regulate process flow when used in conjunction with an actuator assembly. Many single-seat bodies use a cagethree-way or fixed construction to hold the seat ring in place, provide spool guidance, and provide a means of establishing specific valve flow characteristics. Caged or fixed single-seat bodies can also be easily modified by replacing the internals to change the flow characteristics or to provide reduced capacity flow, noise attenuation, or to reduce or eliminate cavitation.

The LN8 series top-guided single-seat control valve is a top-guided, plunger-type single-seat control valve. It was certified by TÜV ISO15848 in 2019. It has the characteristics of high control accuracy, good sealing performance, simple structure and high versatility. Suitable for fluid control in globe control valve working conditions requiring high control accuracy. Bellows seal type can be used. Thousands of applications in the fine chemical, petrochemical, pharmaceutical and other industries.

Performance advantages

Modular design concept, combining the American and Japanese schools of high-precision control and the German school of modular concept.

The inner cavity of the valve body is S-shaped distribution, smooth and without dead corners; the valve body has internal flow guide wings, which can reduce the mutual force of the medium inside the valve body and reduce the occurrence of cavitation.

Simple structure, less dead space in the internal globe control valve parts, reducing the possibility of crystallization and blockage of the medium.

The valve spool adopts upper guidance, which is smoothly guided.

The valve seat adopts floating design, while the sealing surface adopts tapered form to ensure good alignment of the sealing vice.

Spool type face control flow characteristics, accurate flow characteristics control.

Equivalent percentage, linear and fast-opening flow characteristics are available.

Temperature range of application span, -196 ~ 593 ℃ are available in the appropriate structure.

Leakage grade meets GB/T 17213.4-2005 / IEC 60534-4:1999, hard seal up to grade IV, V, fast-opening and soft seal up to grade VI; and pipeline connection with RF, RJ, FM and other flange types and SW, BW welding type.      

The flange distance conforms to GB/T 17213.3-2005 / IEC 60534-3-1:2000; or ISA S75.03-1992 standard.

Long life

1. Valve Trims

According to the needs of the working conditions, different materials and surface hardening treatment can easily be chosen to meet the requirements of each function module of trim to improve its performance of the corrosion, cavitation and erosion resistant, lengthen service life.

2. Valve body

The body of LN8 series control valves consists of two passages from upper and lower, forming a shape like letter "S". The design of an elliptical section reduces the flow resistance and turbulent flow to keep the flow fluent. The flap in the middle of upper passage can reduce the eddy flow and increase the flow capacity.


LN81 Series Single Seat Globe Control Valve

3. pneumatic actuator of globe control valve

The standard mate of LN8 series is AM8 Multi-spring pneumatic diaphragm actuator, which can be used in many conditions with the features of strong output force, high reliability, long lifespan and extensive application. The output force changes with the number of springs. The high stress resistant diaphragm, bearing maximum pressure of 0.5 MPa air supply, gives control valve a reliable shutoff. This type of actuator has a long life cycle with more than 1 million times.


Well Sealed


1. Structure

        A. New function modular design                                   B. Self-centring seat design


LN81 Series Single Seat Globe Control Valve




2. Packing system

The packing box assemblies are also optimized. Seal ring in the gland flange can prevent the dirt from entering and protect the packings. The V-ring is added with an U-groove and its angle is changed from conventional 90 to more efficient 85. The packing is a combination of alternating pure PTFE and PTFE with grafoil. When the temperature of fluid is above 200℃, the packing will be made by grafoil.


High Precision

LN8 series automated globe control valve are designed strictly on the basis of the IEC standard. They are the latest self-innovated modularized straight stroke control valve of SUPCON. We divide the trims into three modules, namely guide, control and seal module. We provide the best solution according to the function of each module and make action, control and seal more reliable.

Each index, linear, hysteresis, dead zone and leakage, for example, is full compliance with national standards.

Note: For below measured results, take LN8100 top guide single seat valve (PN110) as an example.


Test Items
National Standard
SUPCON Standard
Measured Results
Seat Leakage
0.06 L/min
0.064 L/min
0.01L/min
Rated Travel Error
+2.5%
+2%
1.32%
Start Error
±2.5%
±2%
0%
End Error
±2.5%
±2%
0.08%
BasicError
±1.5%
±1%
-0.52%
Hysteresis
1.5%
1%
0.16%
Dead Band
0.6%
0.4%
0.38%


Easy to maintain

The unique platform and modul design make it easy to remove and displace the parts without special tools, and moreover, easy to change the type of the valve only by changing few parts. A variety of material combinations is optional for the parts.



LN81 Series Single Seat Globe Control Valve


Application

Globe Control Valves are available in a variety of sizes (NPS 1/2 to 36) to provide users with high performance and reliability. They can help address a range of application needs from large to small, hot to cold, and average to severe.

Bonnets are available in different styles to accommodate different application temperatures. This primarily includes standard bonnets and optional extended bonnets that can be used to protect the packing material when the valve is used in extremely hot or cold applications.

Special packing configurations are also available for applications that require a packing system to keep the concentration of unorganized emissions below ambient standards.

Some of the most typical applications for globe valves include cooling water systems, fuel oil systems, feedwater or chemical feedwater systems, boiler and main steam vents and drains, and turbine lube systems.


Technical globe control valve dimensions

Nominal diameter: DN15/20/25/32/40/50/65/80/100/125/150/200/250/300

Pressure rating: ANSI CL150/300/600; DIN PN16/25/40/63

Valve body and upper bonnet material: WCB, WC6, WC9, CF8, CF8M, etc.

Upper bonnet form: standard type (-17℃~+316℃); high temperature type (+316℃~+593℃); low temperature Ⅰ type (-45℃ ~ -17℃)

Low temperature Ⅱ type (-100 ℃ ~ -45 ℃); low temperature Ⅲ type (-196 ℃ ~ -100 ℃); bellows type (-45 ℃ ~ +350 ℃)

Packing type: PTFE + graphite V-shaped packing; flexible graphite ring packing; graphite + PTFE preparation packing; etc.

Flow characteristics: equal percentage (%); linear (L); quick-open (Q)

Adjustable ratio: 50:1,100:1(optional)

Allowable leakage: metal seal: ANSI B16.104 Class Ⅳ/V; soft seal: ANSI B16.104 Class Ⅵ

 

Typical performance

Ningbo Huatai Shengfu, 700,000 tons per year of light hydrocarbon comprehensive utilization project

Panjin North Asphalt Fuel Co., Ltd, 70,000 tons of sulfur recovery unit alkali washing section project

Liaoning Baolai Oil Refinery, chemical main unit are applied


we are globe control valve manufacturer, welcome to contact us for globe control valve price!



TECHNICAL PARAMETERS

Nominal SizeDN25 ~ DN200
Pressure RatingPN16/25/40/63/100;CL150(PN20)/300(PN50)/600(PN110)
Operateing Temperature-196℃~ 593℃
CharacteristicsEqual percentage, linear
Rangeability50:1
Seat Leakage ClassANSI B16.104: IV、V、VI
Body MaterialWCB/WCC/LCB/LCC;WC6/WC9;CF8/CF8M;4A/5A etc.
Trim Material630/316/316+ST/316nitriding/316+Ni60/316+WC etc.
Seal MaterialPTFE+ graphite v-shaped packing, flexible graphite ring packing, graphite +PTFE braided packing etc.