PVC – Polyvinyl chloride

Guichon manufactures valves specially adapted to the production of PVC – Polyvinyl chloride :

Piston valve, Injection valve, Tank bottom valve

Piston valve
Type : 655M

DN 1/2" to 12" Class 150 to 1500 Lbs
– Cast construction
– Stainless steel, nickel alloys, special alloys (Titanium, Zirconium..)
Injection piston valve
Type : 659C

DN 1" Class 2500 Lbs
– piston type injection valve
– fully jacketed

Bottom outlet valve
DN 1" x 8" Class 300 Lbs

– Titanium (Ti)


  • Construction materials: Carbon Steel (CS), Stainless Steel (SS), Duplex & Super Duplex, Titanium, Zirconium, Uranus® B6, Tantalum, Nickel, Hastelloy®, Monel
  • Construction methods: Fabricated (Welded), Cast, Solid


  • Service conditions: High pressure, High temperature, Low temperature, Abrasion, Corrosion, High viscosity, Vacuum, Reliability, Low acoustic signature, Dead space free
  • Types of fluids: Liquids, Liquids with solid particles, Gas, Powder and powdery media, High viscosity fluids

FAQ - PVC - Polyvinyl chloride

PVC – Polyvinyl chloride – Uses of Polyvinyl chloride (PVC) :

Polyvinyl chloride (PVC) is the third-most widely produced plastic, after polyethylene and polypropylene. PVC is used in the building and construction industry,consumer goods and packaging. At global level, demand for PVC exceeds 35 million tons per year and it is in constant growth.

Posted in: FAQ - PVC - Polyvinyl chloride

PVC – Polyvinyl chloride – Manufacturing process of Polyvinyl chloride (PVC) :

PVC is produced by polymerization of vinyl chloride monomer (VCM). The main polymerization methods include suspension, emulsion, and bulk (mass) methods. About 80% of production involves suspension polymerization. First, the raw material VCM is pressurized and liquefied, and then fed into the polymerization reactor, which contains water and suspending agents in advance. Next, the initiator is fed into the reactor, and PVC is produced under a few bars at 40 – 60°C.
The role of water is to remove and control the heat given off in the polymerization process. PVC forms as tiny particles which grow and when they reach a desired size the reaction is stopped and any unreacted vinyl chloride is distilled off and re-used. The PVC is separated off and dried to form a white powder also known as PVC resin (see flow diagram).
Emulsion polymerization produces finer resin grades having much smaller particles, which are required by certain applications.

Example of the PVC manufacturing process.

Posted in: FAQ - PVC - Polyvinyl chloride

PVC – Polyvinyl chloride – Recommended valves :

Guichon Valves offers valves specially designed for viscous liquids and designed to minimize pressure drops and dead zones. Jacketed valves allow to maintain the fluid temperature to prevent solidification. Sealants (gaskets, seals, etc …) are selected to prevent pollution of the circulating fluid.

Posted in: FAQ - PVC - Polyvinyl chloride