Lined Plug Valve & Sleeved Plug Valve: A Manufacturer’s Guide

Understanding the differences between a Lined Plug Valve and a Sleeved Plug Valve is crucial for ensuring operational safety and preventing costly downtime in corrosive environments. As a dedicated valve manufacturer since 1989, YOUFUMI provides this guide to help you select the ideal flow control solution for your application.

What is Lined Plug Valve?

A lined plug valve is a quarter-turn valve where all wetted surfaces are protected by a seamlessly molded PFA or FEP lining.This creates a robust barrier against aggressive media, making it ideal for industries like chlor-alkali, mining, and petroleum refining.

Key Benefits:

Maximum Protection: The heavy-duty liner is locked into dovetail recesses in the valve body, preventing liner collapse under vacuum or blowout under high pressure.
Cavity-Free Design: The special body design is cavity-free, which prevents the accumulation and contamination of process media, making it perfect for slurry applications
Reduced Downtime: Features in-line seal adjustment, allowing you to restore seating without removing the valve from the pipeline, which extends service life

Lined Plug Valve

Size:

DN15~DN300

Pressure:

PN10, PN16, 150LB

Material:

WCB, CF8, CF8M, CF3M

Liner:

PFA, FEP

Face-to-face:

HG/T 3704, DIN 3202, ASME B16.10

What is Sleeved Plug Valve?

A sleeved plug valve uses a replaceable PTFE sleeve within the valve body. The plug rotates inside this sleeve, which acts as the primary seal and isolates the valve body from the process media.

Key Benefits:

Sleeve Type Plug Valve

Size:

DN15~DN300

Pressure:

PN10, PN16, 150LB

Sleeve Materia:

PTFE

Material:

WCB, CF8, CF8M, CF3M

Face-to-face:

HG/T 3704, DIN 3202, ASME B16.10

Lined vs. Sleeved Plug Valves: Key Differences

Plug Valve Comparison

Feature	Lined Plug Valve	Sleeved Plug Valve
Construction	The entire wetted area is protected by a thick, molded PFA/FEP liner locked into the body.	A replaceable PTFE sleeve is fitted into the body cavity, providing the primary seal.
Key Advantage	Maximum corrosion protection for the most aggressive media, high temperatures, and vacuum service.	Excellent sealing with a field-replaceable wear component, offering great value and simple maintenance.

Applications & Industries

Our lined and sleeved plug valves are engineered to handle the most demanding corrosive and high-purity applications across a wide range of global industries.

Typical Applications (Media Handled)

Key Industries Served

Complementary System Protection: Lined Safety Valves

While Lined and Sleeved Plug Valves are essential for controlling flow, ensuring the overall safety of your system is paramount. For this reason, YOUFUMI also manufactures

Lined Safety Valve

Design & Manufacture Standard

GB/T12241, GB/T12243

Face-to-face Dimension Standard

JB/T2203

Flange Standard

HG/T20592, GB/T9119

Nominal Diameter

DN15~DN400

Nominal Pressure

PN16, 150LB

What does a safety relief valve do?

A safety relief valve is a critical safety device whose purpose is to provide overpressure protection. It automatically opens to discharge fluid when the system pressure exceeds a predetermined set point. Once the pressure returns to a safe level, the valve closes, preventing further flow. In corrosive environments like hydrochloric or sulfuric acid, a YOUFUMI lined safety valve is critical.Its PFA or F46 lining and PTFE bellows seal protect the valve’s internal mechanisms from corrosion, guaranteeing reliable operation in an emergency while preventing hazardous leaks.

What is the difference between a pressure relief valve and a safety relief valve?

While the terms are often used interchangeably, there is a technical distinction in how they operate:

Safety Valves: Are generally characterized by a rapid, full-opening “pop action” to discharge pressure very quickly. They are most often used for compressible fluids like gases and steam.

Relief Valves: Typically open in proportion to the increase in system pressure. They are used for incompressible fluids like liquids where a gradual release of pressure is sufficient.

YOUFUMI’s lined safety valves are engineered to provide reliable overpressure protection for corrosive liquids, gases, and vapors, accommodating the specific safety needs of your system.