News - Fully Lined Polyurethane Knife Gate Valve Abrasive Resistant

What is a polyurethane knife gate valve

Polyurethane knife gate valve refers to a knife gate valve with a polyurethane valve seat seal. Polyurethane (PU) has the characteristics of oil resistance, wear resistance, low temperature resistance, aging resistance, high hardness, excellent elasticity and good anti-toxic performance. It is often used for high-hardness particles and medium pipelines containing gas and liquid. It has good sealing performance and high-strength wear resistance.

Polyurethane is known as “wear-resistant rubber”. Its oil resistance is not lower than that of nitrile rubber and is equivalent to polysulfide rubber. It is very suitable for various medium pipelines that require high sealing and high-strength particle erosion.

Performance Analysis of Polyurethane Materials
Molding process	Main chemical components of polyurethane
High-pressure injection molding	Isocyanate Polycarbonate
Polyurethane Performance Parameters
Volume density g/cm3	Tensile strength N/mm	Shore A hardness	Fixed elongation N/mm2	Elongation at break %
1.21+0.02	Min 45	95+5	Min 15	Min 300

Product Information of Polyurethane Knife Gate Valve

PRODUCT RANGE:

Sizes: NPS 2 to NPS 48

Pressure Range: Class 150, PN16, PN10

Flange Connection: Flange

Operation: Manual, electric, gearbox, pneumatic, manual pneumatic, hydraulic, electro-hydraulic, sprocket, lever

Suitable Medium: Pulp, sewage, coal slurry, ash, particles, dust, slag-water mixture

Knife Gate Valve Materials:

Casting: (GGG40, GGG50, A216 WCB, A351 CF3, CF8, CF3M, CF8M, A995 4A, 5A, A352 LCB, LCC, LC2) Monel,

Inconel, Hastelloy,UB6

Standards of PU Knife Gate Valve

Design & manufacture	MSS SP-81
Face-to-face	MSS SP-81
End Connection	ASME B16.5, ASME B16.47, MSS SP-44 (NPS 22 Only)
Test & inspection	MSS SP-81
Also available per	NACE MR-0175, NACE MR-0103, ISO 15848
Other	PMI, UT, RT, PT, MT

Design Features:

Polyurethane Knife Gate Valve which makes it one of the best abrasive resistant materials. Our Polyurethane Knife Gate Valve (NSW) is full lined with high quality urethane, which far exceeds the wear-life of gum rubber and any other softer liner, or sleeve materials.

1. Zero leakage: Full lined urethane valve body and molded elastomer gate seal prevents leakage permanently both the valve sealing and the valve body itself during working.

2. Extended wear-life: High quality abrasive resistant urethane liners, and robust stainless knife gates as well as the unique design of the valve itself provide an extremely long service life.

3. Bi-directional shut-off: When back flow happens NSW can be used as a preventer as well.

4. Self-flushing design: During valve closing the beveled knife gate redirects flowing slurry towards the beveled urethane liner seat, develops turbulence and intensifies the flow then flushes the slurry out of the bottom of the urethane as the gate settles into the seat.

5. Convenient rebuilds: When finally rebuilds are necessary, the wear-parts (urethanes, gate seals, knife gates) can all be replaced in field. Valve bodies and other parts are reusable.

Options

1. Seat Ring (Liners): Varieties of urethanes are available.

2. Valve Gates: SS304 gates with hard chromium coated are standard. Other alloys are available (SS316, 410, 416, 17-4PH…) Optional gate coatings are also available.