Design Features And Selection Of Ptfe-lined Y-type Filters

To prevent acid corrosion in carbon steel piping, install a PTFE lined Y‑type strainer with flange connections (PN10, PN16, or 150LBS). Select PTFE lining for -29°C to 180°C or PFA lining for -29°C to 200°C. The lining isolates fluid from metal, eliminating pitting. This strainer removes particles down to 0.5 mm, protects pumps and valves, and handles sizes DN15-DN300.

The Corrosion and Failure Threat

Hydrochloric and sulfuric acids attack unprotected carbon steel. Pitting, intergranular corrosion, and stress cracking lead to wall penetration and sudden leaks. These failures release toxic fumes, force shutdowns, and damage equipment. A PTFE lined strainer stops corrosion at the source while capturing debris.

Failure modes eliminated:

• 🛑 Pitting from chloride and acid attack

• ⚙️ Intergranular corrosion along grain boundaries

• 🔧 Stress corrosion cracking from loading

• 🧪 Erosion from high‑velocity particulates

• 🚫 Permeation through unprotected walls

Flange Connection and Pressure Ratings

The strainer connects via flange (EN 1092-1, ASME B16.5, JIS) in PN10, PN16, or 150LBS ratings. Flange joints withstand thermal cycling and stress. The design fits raised and flat face flanges with centering lugs. Flanges simplify installation and removal.

Y‑Type Strainer Design

The Y‑type strainer has a cast body with an inclined screen basket. Fluid enters, passes through the screen, and exits while solids are trapped. The PTFE lining covers all wetted surfaces, including the body and screen support. This removes particles down to 0.5 mm while the PTFE lined pipework stays protected.

Key design features:

1. One‑piece investment cast body minimizes leak paths

2. PTFE lining (2‑3 mm) covers all wetted surfaces

3. Removable screen basket for cleaning without line removal

4. Blow‑down port for flushing accumulated solids

5. Flange connections for easy installation

Lining Material Properties

PTFE resists hydrochloric acid, sulfuric acid, and most solvents from -29°C to 180°C. Its non‑stick surface prevents adhesion and eases cleaning. PFA offers similar resistance up to 200°C with lower permeation. Both linings are applied through isostatic pressing or injection molding for a pore‑free barrier.

Specifications and Selection Criteria

Applications and Selection Considerations

1. The PTFE lined strainer is installed upstream of pumps, control valves, flow meters, and spray nozzles to remove abrasive particulates and corrosive carryover.

2. When specifying, evaluate media type, pressure (PN10, PN16, or 150LBS), temperature range, and mesh size. The PTFE lined pipework ensures complete isolation.

3. For high‑temperature or permeation‑sensitive services, PFA lined options are available. The PTFE lined tee fittings in the same line maintain the same protection.

4. The Y‑type design suits horizontal or vertical installation with the screen basket oriented downward.

Installation and Maintenance

Flange connect per torque specs. Use PTFE gaskets matched to media and temperature. Align the screen basket cover for easy access. The strainer supports in‑line cleaning through the blow‑down port or by removing the screen basket. Inspect the PTFE lining for scratches or wear during routine service. Replace the screen basket and gaskets every 12‑18 months. The PTFE lined strainer offers a cost‑effective solution compared to exotic alloys, and the PTFE lined pipe price is lower than solid corrosion‑resistant alloys.

This strainer design protects equipment in chemical plants where unprotected metal poses continuous corrosion risk. When specifying PTFE lined pipework, consider total cost — the initial PTFE lined pipe price is offset by extended equipment life and reduced downtime.

FVF PTFE Lined Y-Type Stainer

• FVF lined strainer is the corrosion resistant equipment that used in a variety of corrosive services for the removal of debris from the pipeline or solid particles from the media.
• The unique design allows the strainer to be easily removed for cleaning or replacement. Impurity substance stops at PTFE screen so that the purity flow can go through the strainer. After a period of time, take out the dismountable filter screen tub, and it can be reassembled after cleaning.Therefore it is easy maintenance.
• Screen size of the lined strainer ranges from 16 to 100 meshes and 16 meshes as standard.
• By far the lined strainer is widely used in petroleum, chemical pharmaceutical and environmental protection industries. It can not only enlarge the lifespan of pump and other equipment, but also ensure the safety of the complete system. Lined strainer becomes the indispensable equipment for industrial production.

Product Parameter

Materials of Main Parts

Technical Specification