English

English

Get a Quote
Products

Hot Products

Company News

Top 5 Industrial Valve Types Every Engineer Should Know in 2026
Top 5 Industrial Valve Types Every Engineer Should Know in 2026
2026-03-27

Choosing the right industrial valve type is one of the most critical decisions in system design. A poor selection—even when using high-quality valves—can lead to leakage, pressure loss, vibration, frequent maintenance, and long-term operational inefficiency. This guide covers the main industrial valve types, their applications, advantages, and limitations, along with practical insights to help you make the right valve selection for your project in 2026.   What Are Industrial Valve Types? Industrial valve types refer to different valve designs used to control, regulate, or isolate fluid flow in piping systems. Each type is engineered for a specific function—such as shut-off, throttling, or backflow prevention—and selecting the correct type is essential for system safety and efficiency.   5 Main Industrial Valve Types and Their Applications 1. Ball Valve Best for: Quick shut-off and low pressure drop Ball valves use a rotating ball with a straight-through bore. When fully open, they provide minimal resistance, making them one of the most efficient options for fluid transmission. Common applications:      ● Oil and gas pipelines      ● High-pressure systems      ● Frequent on/off operations Selection notes:      ● Full-port designs minimize energy loss      ● Metal-seated ball valves perform better in abrasive or high-cycle conditions   Avoid if:Precise flow control is required. Throttling with a ball valve can damage sealing surfaces over time.   2. Gate Valve Best for: Isolation service with minimal flow resistance Gate valves operate by lifting a gate out of the flow path. They are widely used in large-diameter pipelines where full open or full close operation is required. Common applications:      ● Long-distance transmission pipelines      ● Water treatment systems      ● High-temperature steam lines Selection notes:      ● Near-zero pressure drop when fully open      ● Wedge gate valves provide better sealing in high-temperature conditions   Avoid if:Frequent operation or throttling is required. Gate valves are not designed for repeated cycling.   3. Globe Valve Best for: Precise flow regulation Globe valves force fluid through a controlled flow path, allowing accurate throttling and stable flow control. Common applications:      ● Steam systems      ● High-temperature processes      ● Flow regulation applications Selection notes:      ● Excellent throttling performance      ● Stable operation under fluctuating flow conditions   Avoid if:Pressure drop must be minimized. Globe valves inherently create higher flow resistance.   4. Check Valve Best for: Automatic backflow prevention Check valves operate automatically based on flow directi...

Can Line Blind Valves Handle High-Temperature Steam Applications?
Can Line Blind Valves Handle High-Temperature Steam Applications?
2026-03-19

Recently, Dervos Valve helped a client in Hungary overcome a common challenge in industrial steam systems: how to safely isolate high-temperature pipelines without leakage or downtime.   Operating with saturated steam at around 250°C and exposed to temperatures as low as -39°C, the client’s system demanded a solution that was both robust and reliable. Traditional valves often failed to maintain a tight seal under such conditions, and conventional isolation methods required depressurizing the line, increasing downtime and operational risk.   To address these challenges, Dervos supplied a DN400 PN40 sliding line blind valve, engineered specifically for the project’s harsh conditions. The valve’s sliding blind mechanism allows operators to switch between flow and isolation positions without depressurizing the system, enhancing safety and efficiency during maintenance.   Built with forged 20GML steel and a metal-to-metal stainless steel sealing structure, the valve delivers reliable performance under both high-temperature steam and extreme outdoor climates. Its full-bore design minimizes flow resistance, while the worm gear manual actuator ensures smooth and controlled operation even at large sizes and high pressure ratings. Safety features such as anti-misoperation devices and protective blind plate structures further reduce the risk of errors during handling.   Since installation, the valve has enabled leak-free operation, safer maintenance procedures, and stable performance in extreme temperatures. Designed for a service life exceeding 30 years, it provides a long-term, low-maintenance solution, giving the client confidence in their steam system’s reliability and safety.   This project highlights how a carefully engineered sliding line blind valve can solve critical isolation challenges in high-temperature steam applications, combining operational safety, durability, and efficiency in one solution.

Are Gate Valves Full Port?
Are Gate Valves Full Port?
2026-03-13

In industrial piping systems, gate valves are generally considered low-resistance isolation valves. When the valve is fully open, the gate is completely withdrawn from the flow path, allowing the fluid to pass through with minimal obstruction.   However, from a strict engineering perspective, not all gate valves are classified as full port valves.   If the seat bore is equal to or very close to the pipeline internal diameter, the flow experiences little or no restriction. In this case, the valve can be considered full port (or near full port). This design is commonly used in oil and gas pipelines, water transmission systems, and other applications where low pressure drop is required.   If the seat bore is slightly smaller than the pipe internal diameter, a minor flow restriction will occur inside the valve. In such cases, the valve is more accurately described as reduced bore. This configuration is more common in smaller sizes or cost-optimized valve designs.   In engineering practice, a simple selection logic can be applied: ● If the system requires minimum flow resistance or pipeline pigging, the valve bore must match the pipeline diameter. ● If the valve is used for general isolation purposes, most standard gate valves can already meet the required flow capacity.   Therefore, a concise conclusion can be drawn: Gate valves are typically close to full port designs, but whether they are truly full bore depends on whether the seat bore equals the pipeline internal diameter.   QA   Q1: Are gate valves always full bore?Not necessarily. If the seat bore equals the pipe internal diameter, the valve can be considered full bore. If it is slightly smaller, it is classified as reduced bore.   Q2: Why do gate valves have relatively low flow resistance?When the valve is fully open, the gate is completely removed from the flow path, allowing the fluid to pass through in a nearly straight line, which results in low pressure drop.   Q3: Are gate valves suitable for high-flow pipelines?Yes. If the system requires low pressure drop, gate valves are commonly used.   Q4: Is the concept of full port the same for gate valves and ball valves?Not exactly. For ball valves, the bore size is determined by the ball port diameter, while for gate valves, it is mainly determined by the seat bore diameter.

Wafer Check Valve
加载中...

18" 150LB Dual Plate Wafer Lug Type Check Valve API594

18" 150LB wafer check valve is made according to API 594 standard. The valve body is made of A395 Ductile Iron. It has the structural characteristics of double disc. Its connection mode is LUG RF.

  • Payment:

    30% when order confirmed, 70% before shipment
  • Product Origin:

    China
  • Color:

    Customization
  • Shipping Port:

    Shanghai, China
  • Lead Time:

    30~60 days Ex Works after order confirmation
  • Material:

    A395 Ductile Iron
Inquiry now
Product Detail

Product Description

Type

Wafer Check Valve

Size

18"

Pressure

150LB

Connection

LUG RF

Body Material

A395 Ductile Iron

Design Norm

API 594

Pressure-temperature

ANSI B16.34

Flange Ends

ANSI B16.5

Face to Face Dimension

API 594

Test & Inspection Code

API 598

Applicable Medium

Water, Oil and Gas

Features

1. The structure is short in length, small in size and light in weight;

2. Sensitive action, good sealing performance, long service life and high reliability.

Technical Drawing

Dimension Checking

Pressure Testing

Nameplate & Packing

Inspection report

Leave A Message

If you are interested in our products and want to know more details,please leave a message here,we will reply you as soon as we can.

Related Products
Dual Disc Lug Check Valve 150 LB
Duplex SS Check Valve Lug Type Dual Plate 8 Inch Class 150

The 8 inch 150 LB dual disc non return check valve, designed per API 594, has dual plate and lug connection. The retainerless dual  plate check valve is made of duplex stainless steel 4A as its body and trim material. Quick Detail Type Check Valve Size 8'' DesignPressure Class 150 Construction Dual Plate Type, Retainerless Connection Lug Type Design & Manufacture API 594 End to End ASME B16.10 Connection ASME B16.5 Pressure & Temp ASME B16.34 Test & Inspection API 598 Body Material Duplex Stainless Steel 4A Trim Material Duplex Stainless Steel Media W.O.G. Design Feature 1.Shor face to face dimension 2.Small in size with light weight 3.Swift close of disc with small water hammer 4.Vertically or horizontally installed 5.Smooth flow passway with small flow resistance 6.Long cycle life and high reliability

6 Inch Dual Check Valve
Wafer Check Valve AL Bronze C95800 Dual Disc 6 Inch

The dual disc wafer check valve is designed as per API 594 and tested per API 598. The bronze non return valve is applicable for sea water. Quick Detail Type Check Valve Size 6'' DesignPressure Class 150 Construction Dual Plate Type, With Retainer Connection Wafer Type Design & Manufacture API 594 End to End ASME B16.10 Connection ASME B16.5 Pressure & Temp ASME B16.34 Test & Inspection API 598 Body Material Aluminum Bronze C95800 Trim Material Aluminum Bronze C95800 Media W.O.G. Dervos Inspection after Valve Assembly Valve quality is one of perspectives we care about most. In Dervos, quality control starts from raw material, machining, assembly to pre-shipment inspection. After assembly, the quality checking team will do visual checking, dimension checking, hydraulic testing and air testing. Every order must pass the test per inspection standards. Otherwise our quality checking team will not release the shipment. Inspection Reports Documents can be used to prove how we control valve quality. Along with every order, Dervos will provide clients with an inspection report & a 3.1 mill test report for free. In Dervos inspection report, you will see the actual results of dimension checking and pressure testing along with painting and packing picture. All these info are shown through data and clear pictures.   In 3.1 mill test report, we will show you the chemical composition, mechanical property and heat number for valve body, bonnet, stem, disc and so on.  

Double Disc Check Valve
Double Disc Check Valve DN3202 PN25 DN100 CF8

The double- disc check valve, made of CF8 stainless steel, has excellent resistance to corrosion. Designed in accordance with DIN 3202, the check valve is about to connect to pipes with WAFER. Quick Detail Type Check Valve Nominal Diameter DN100 NominalPressure PN25 Construction Double disc/ Dual Plate Connection Wafer Type Design & Manufacture DIN 3202 End to End  DIN 3202 Flange End Dimension DIN 2401 Test & Inspection  API 598 Temperature Range -29℃~+425℃ Body Material A351 CF8 Wedge Material A351 CF8 Media W.O.G. Dervos Packaging Good packing means good first impression. Just imagine how do you feel differently when seeing two boxes below? And you will know the reason why in Dervos we value packaging so much. In Dervos, we make sure- 1. Every valve isclean and dry. What do we do? -Clean the valve before packing -Add anti-rust oil -Add flange cover 2. No damageto valves in delivery. How do we achieve this? -Fix the valve with iron wire -Separate the valve with soft material -Layer the valve with plywood 3. Strong box and clear shipping mark

Retainerless Wafer Lug type Check Valve 6'' 900LB
Retainerless Wafer Lug type Check Valve 6'' 900LB

The 6 inch Wafer check valve is made in strict accordance to API 594. The body material LCC make sure the lug type valve is capable to handle harsh environment, and the INCONEL-X 750 spring promise the valve a long service life.

Dual Plate Wafer Check Valve API 594 DN250 10K
Dual Plate Wafer Check Valve API 594 DN250 10K

The double-disc check valve, made of A395 D1, has excellent resistance to corrosion. Designed in accordance with API594, the check valve is connected to pipes with WAFER. This valve is eligible to be put in marine working conditions.

API594 Dual-Plate WAFER Check Valve WCB 300LB
API594 Dual-Plate WAFER Check Valve WCB 300LB

The 10 inch Dual-Plate WAFER Check Valve is made of WCB and is eligible to be put under pressure up to 30LB. All Dervos check valves are tested to API 598 and must meet or exceed all applicable API, ANSI and ASTM Standards.

DIN Single Plate WAFER Check Valve DN80 PN40
DIN Single Plate WAFER Check Valve DN80 PN40

The single-disc check valve, made of CF8, has excellent resistance to corrosion. Designed in accordance with API594, the valve is of a WAFER type.

Check Valve
Single Disc Wafer Check Valve 6 Inch 150LB

The 6 inch 150 LB single disc wafer check valve, designed per API 594, has one disc and wafer connection. It will have the best performance under -29 to 350 Celsius degree.

Wafer Check Valve
3" 150LB Dual Plate Wafer Check Valve API594 A995 5A

3" 150LB wafer check valve is made according to API594 standard. The valve body is made of A995 5A. It has the structural characteristics of built-in type and dual plate. Its connection mode is wafer type.

Wafer Check Valve
CF8M 20" 150LB Dual Plate Wafer Check Valve API594

20" 150LB wafer check valve is made according to API594 standard. The valve body is made of A351 CF8M. It has dual plate and built-in type structural features. Its connection mode is Wafer RF.

Wafer Check Valve
20" 300LB Dual Plate Wafer Check Valve WCB API 594

20" 300LB wafer check valve is made according to API 594 standard. The valve body is made of WCB. It has the structural characteristics of double plate and built-in type. Its connection mode is wafer type.

Leave a message

    If you are interested in our products and want to know more details,please leave a message here,we will reply you as soon as we can.

Home

Products

about

contact