PFA / FEP Lined Ball Check Valves

Construction of Material :-

Casting Material Specifications :-

Ø      Cast Iron                      : IS 210, G.R. – F. G. – 200

Ø      Ductile Iron                 : ASTM A395

Ø      Cast Steel                     : ASTM A216, G.R. – WCB

Ø      S. S. 304                       : ASTM A351 CF8

Ø      S. S. 304L                     : ASTM A351 CF3

Ø      S. S. 316                       : ASTM A351 CF8M

Ø      S. S. 316L                     : ASTM A351 CF3M

Ø      Alloy 20                        : ASTM A351 CN7M

Design Standard :-

Ø    BS 5351, Short Pattern / As per manufacturer’s std.

Standard Resin Specifications :-

Ø     PFA       :   ASTM D 3418

Ø     FEP       :   ASTM D 2116

Service Temperature : -

PFA :-

Ø      Maximum continuous service temperature    :   265° C

Ø      Melt point                                                          :   305° C

FEP :-

Ø      Maximum continuous service temperature    :   200° C

Ø      Melt point                                                          :   260° C

Lining Thickness : -

Ø      Minimum Lining thickness would be 3.0 mm over all wetted portion.

Chemical Inertness :-

Ø      PFA / FEP is chemically inert to most of the all chemicals and solvents with the exception of molten alkali metals.

Ø      PFA / FEP lined valves are used to convey, and are inert to, these chemicals : All acids including hydrofluoric, sulphuric and aqua regia, all caustic, all chlorides – organic and inorganic, all solvents, all bleach solutions, all peroxides, all phenols and any combinations of above materials.

Ø     Combined with the chemical inertness of PFA / FEP is its unique non-stick property. Thus a PFA / FEP lined products eliminate or minimize the built up of deposits of the products which otherwise reduce flow and affect processing operations.      

PFA / FEP Lined Ball Check Valves

Finish :-

Ø      The interior surface of all valves are clean and free of mold burrs, rust, scale or others that may adversely affect the performance of lining.

Ø     The exterior surface of all valve bodies are be cleaned by sand / shot blasting and painted by 1 coat of Epoxy primer and 2 coats of Polyurethane Top coat. 

Products Inspection and Testing :-

Hydrostatic Pressure :-

Ø      Body Test   : 10 Kg/Cm²

Ø      Seat Test    : 10 Kg/Cm² 

(Hydrostatic pressure at room temperature using clean water.)

Electrostatic Pressure :-

Ø     Non-destructive high-voltage test at an output voltage of 10,000 V. When electric contact is made, a visible/ audible spark or both occur at the probe if there is any defect in lining.

Visual Inspection :-

Ø      All surfaces are free from blister, porosity or any other defect. All checks / tests are conducted before shipment.

Storage & Transport :-

Ø  Each end of valve is protected by specially made rubber cap so that products are capable to withstand normal handling during transport.

Ø   All the materials are supplied with export wooden case or card box packing depending upon the weight and mode of shipment.