What raw materials can Ruitu bromine extraction systems process?

Our bromine extraction systems are designed for seawater, bitter brine, salt lake brine, oilfield water, bromine-bearing industrial wastewater and concentrated brine from desalination plants. The process route is selected only after we review a laboratory analysis of your feed.

Do you supply single machines or complete plants?

Both. We supply individual machines such as salt washers, roller crushers, dryers, vibrating screens, belt conveyors and hot air furnaces, and we also deliver complete turnkey lines under an EPC contract.

What is included in your EPC service?

Water quality testing, site selection support, process design, project launch preparation, equipment manufacturing and procurement, packing and shipping, installation and commissioning, operator training, finished product production guidance, and output buy-back or decommissioning support where agreed.

Can your salt washing equipment produce food-grade salt?

Our salt washing machinery is used for both food-grade and chemical-grade salt. The achievable grade depends on the crude salt composition and the standard that applies in your market, so we design the washing, crushing, drying and screening stages around your target specification.

How do you support overseas installation?

Our engineers can be dispatched to site for installation and commissioning, train your operators, and stay involved until the line produces finished product at the designed daily capacity.

How do I start a project with Ruitu?

Send us your raw material analysis, target daily capacity, product specification and site information by email or phone. Our technicians will prepare a preliminary budget estimate and an economic benefit analysis based on your budget and expected output.

China PTFE-Lined Expansion Joint Product, Products

1 / 1

China PTFE-Lined Expansion Joint Product, Products

Brand: Ruitu Automation

Product origin: China

Type: Bellows expansion joint with internal lining of polytetrafluoroethylene (PTFE), equipped with a flange connection structure.

Application: Used in piping systems for highly corrosive media. It can absorb displacement caused by thermal expansion and contraction as well as mechanical vibration of pipelines, compensate for pipeline deformation, and ensure stable operation of the piping system.

Advantages: The PTFE lining is resistant to strong acids and alkalis, suitable for extreme corrosive working conditions. The bellows structure provides a large compensation capacity and can effectively relieve pipeline stress. The flange connection ensures stable installation and strong adaptability.

Send Inquiry

Product Description

Core Overview

PTFE-lined expansion joints, also known as fluoroplastic bellows compensators, are critical components designed to absorb thermal expansion, vibration, and mechanical movement in piping systems handling highly corrosive media. Constructed with a multi-layered PTFE bellows core reinforced by stainless steel wire mesh or outer rings, and flanged with carbon or stainless steel, these joints provide an impermeable barrier against aggressive chemicals. They are extensively used in chemical processing, pharmaceutical manufacturing, and power generation industries where standard metal bellows would fail due to corrosion. The unique design ensures flexibility while maintaining the structural integrity required for high-pressure and vacuum applications.

Basic Specifications

Item	Details
Product Name	PTFE (Polytetrafluoroethylene) Lined Expansion Joint (Compensator)
Executive Standards	HG/T 21562, ASME B16.5, GB/T 12224, GB/T 12777
Nominal Diameter	DN15 – DN300 (1/2" – 12")
Pressure Rating	PN10, PN16, PN25, PN40 / Class 150, Class 300
Structure Type	Axial type, Lateral type, Angular type, Universal type (with limit device optional)
Shell & Bellows Material	Carbon Steel (Q235B, 20#), Stainless Steel (304, 316L)
Lining Material	Polytetrafluoroethylene (PTFE), PFA optional for high temperature requirements
Lining Thickness	2.0–6.0 mm (Standard: 3.0–4.0 mm)
Connection Type	Flanged Connection (RF Raised Face), Welded connection optional
Operating Temperature	-20℃ to +180℃ (-4°F to +356°F)
Core Performance	Absorb thermal expansion & contraction, pipeline displacement, mechanical vibration; reduce noise and pipeline stress
Applicable Medium	Strong acids, strong alkalis, strong oxits, organic solvents and other highly corrosive media
Factory Inspection	Hydrostatic pressure test, Spark pinhole leakage test (5kV), Air tightness test, Cycle fatigue test
Main Applications	Chemical industry, petrochemical, pharmaceutical, metallurgy, environmental protection, fluorine chemical, sewage treatment industries

Typical Dimensions Table

Nominal Diameter DN	Bellows Outer Diameter (mm)	Free Length (mm)	Max Axial Compensation (mm)	Flange Outer Diameter (mm)	Bolt Circle Diameter (mm)	Lining Thickness (mm)
15	24	120	±6	90	60	3.0
20	30	130	±7	100	70	3.0
25	38	140	±8	115	80	3.5
32	48	150	±9	140	100	3.5
40	58	160	±10	150	110	3.5
50	70	180	±12	165	125	4.0
65	86	200	±15	185	145	4.0
80	102	220	±18	200	160	4.0
100	120	240	±20	220	180	4.5
125	148	270	±22	250	210	4.5
150	180	300	±25	285	240	5.0
200	240	350	±30	340	295	5.5
250	300	400	±35	405	355	6.0
300	360	450	±40	460	410	6.0

Core Advantages

Advantage	Description
Exceptional Chemical Resistance	Inert to almost all industrial acids, alkalis, and solvents, ensuring long-term durability in harsh environments.
High Flexibility & Movement Absorption	Effectively absorbs axial, lateral, and angular movements, reducing stress on connected piping and equipment.
Vacuum & Pressure Stability	Reinforced structure prevents bellows collapse under full vacuum and withstands significant positive pressure.
Low Friction & Non-Adhesive	Smooth PTFE surface prevents material buildup and scaling, maintaining consistent flow rates and reducing maintenance.
Thermal Insulation Properties	PTFE’s low thermal conductivity helps minimize heat loss or gain in sensitive process lines.

Frequently Asked Questions

What makes PTFE-lined expansion joints suitable for highly corrosive media?

PTFE is chemically inert to virtually all industrial chemicals, strong acids, strong alkalis, and organic solvents. The seamless liner forms an impermeable barrier that completely shields metal components from chemical attack.

What is the standard operating temperature range for these expansion joints?

Standard PTFE-lined expansion joints operate effectively within a temperature range of -20°C to +180°C (-4°F to +356°F). PFA lining can be selected for specialized applications requiring higher thermal tolerance.

How does the design prevent bellows collapse during vacuum conditions?

The multi-layer bellows structure is reinforced externally with stainless steel wire mesh or external root rings, maintaining cross-sectional geometry and preventing collapse under negative pressure or full vacuum.

What quality and safety tests are performed prior to shipment?

Every joint undergoes strict factory inspections including a 5kV spark pinhole leakage test to ensure liner integrity, hydrostatic pressure tests, air tightness tests, and cycle fatigue tests according to international standards.

Can these expansion joints handle simultaneous axial and lateral movements?

Yes, depending on the structure type chosen (axial, lateral, angular, or universal), the flexible multi-convolution PTFE bellows can simultaneously absorb multi-directional movements, thermal shifts, and mechanical vibrations.