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Valves

BUTTERFLY VALVES

Valves

BUTTERFLY VALVES

Chemline’s plastic butterfly valves include concentric (full seat), double eccentric, and damper designs. A wide selection of materials are available for all services from water to aggressive chemicals. Chemline butterfly valves have had successful long-term experience in thermoplastic and composite piping systems, also tank trucks.

Butterfly Valve Selection

Elastomer Seated Butterfly Valves

For most water and chemical applications. Available 1-1/2” to 40”.
MaterialsSizesDiscSeatCostModel
PP, PVDF1-1/2” to 16”PP, PVC, CPVC, PVDF*EPDM, FKM**$$$Type 58
PP16” to 24”PPEPDM$$$Type 58
PVC, CPVC2" to 12"PVC, CPVCEPDM, FKM$Type 60
PVC2-1/2” to 8”PVCEPDM, FKM$Type 61 w/420B SS Shaft
PVC2-1/2” to 8”PVCEPDM, FKM$$Type 61 w/316 SS Shaft
PP2-1/2” to 8”PP, CPVC, PVDF, ABSEPDM, FKM$$$Type 61 w/316 SS Shaft
PVC, PP, CPVC1-1/2” to 14”PVC, PP, CPVC, PVDFEPDM, FKM$$$$Type 57P
PP16” to 24”PP, PVC, CPVC, PVDFEPDM, FKM$$$$Type 75
PP28” to 40”PP, PVCEPDM, FKM$$$GY Series Giant
PVC, PP2” to 12”PVC, PPEPDM, FKM$$Type 71 Double Eccentric

* PVC & CPVC discs up to 10”, PVDF disc to 12”
** FKM seats up to 16”

 

Butterfly Valve Type 58

Type 58

An industrial full elastomer seated butterfly valve with PP body as standard, in sizes up to 24”.

chemline_type-60_butterfly-valve_500x400

Type 60

Competitively priced for pools, fountains, irrigation and fertigation applications.

Butterfly Valve Type 61

Type 61

PVC butterfly valves up to 8” with patented disc design for linear flow control, NSF approved for potable water. Choice of 420B or 316 SS shaft. Actuation is simple.

Butterfly Valve Type 57P

Type 57P

An industrial full elastomer seated butterfly valve.

Butterfly Valve Type 75

Type 75

An industrial full elastomer seated butterfly valve available in polypropylene body.

Butterfly Valve GY Series Giant

GY Series Giant

Giant PP body valve with full elastomer seat for tight sealing 28” to 40” size.

Butterfly Valve Type 71

Type 71

A double eccentric valve available up to 12” in PVC and PP.

Fluoropolymer Lined Butterfly Valves

For severe chemical services at higher temperatures. Available 2” to 42”.
MaterialsSizesDiscSeatCostModel
PPG, PPSG w/steel core***3” to 12”PFA covered SSPFA$$$HY Series Hybrid
Vinyl Ester carbon-glass filled Composite2” to 12”PFA Covered SS and othersTFM and others$$$$CST-K Series ChemValve
Ductile Iron-Epoxy Coated1-1/2” to 42”PFA Covered 316SS and othersTFM and others$$$$CST Series ChemValve

*** Hybrid butterfly valves have a PFA liner

Butterfly Valve HY Series Hybrid

HY Series Hybrid

HY Series Composite valve with internal steel reinforcement, fully lined with PFA, wafer or lug body, for severe chemical services up to 160 C / 320 deg. F.

Butterfly Valve_CST-K Series Chemvalve_Chemline Plastics_500x400

CST-K Series ChemValve - Composite

Composite body of carbon and glass reinforced vinyl ester, PFA lined, wafer or lug body. For severe chemical services up to 130 C / 265 deg. F.

Butterfly Valve_CST Series Chemvalve_Chemline Plastics_500x400

CST Series ChemValve - Metal Body

Epoxy coated ductile iron body, PFA lined, sizes up to 40”. For severe chemical services. Choice of elastomer seats and metal discs also.

Low Leakage Damper Butterfly Valves

For corrosive gasses in FRP ducting systems. Available 24” to 96”.
MaterialsSizesDiscSeatCostModel
FRP24” to 96”FRPNone$$DBF Series

Butterfly Valve DBF Series

DBF Series - Large Diameter FRP Damper

For large diameter FRP ducting systems up to 96”, handling corrosive gases.

Why a Butterfly Valve?

Their quick opening quarter-turn operation makes butterfly valves popular. They are generally the most economical plastic shut-off valve type in all sizes above 3”. Pressure drop is low, making them a good choice as an isolating valve. Maintenance is simple due to the small number of moving parts. Their short face-to-face-dimension makes them space efficient and relatively light.

Butterfly valves are used in on/off applications as well as for modulating flow control. Each valve has a range where it operates with relatively linear flow control.

Relatively low stem torques make them inexpensive to actuate. Most Chemline butterfly models may be actuated at minimal mounting cost. Electric and pneumatic actuators, plus all accessories are available.

Although not designed for abrasion resistance, Chemline butterfly valves with optional PVDF discs last the longest and are a better choice than ball valves.

Butterfly valves stand up better than ball valves in subzero temperatures because the bodies are sandwiched between flanges leaving only the operators
exposed to possible impact.

Installation requires pipe companion flanges, gaskets and bolts/nut/washer sets.

How do Butterfly Valves work?

Most Chemline butterfly valves are “concentric” design. A stainless steel shaft passes through a plastic disc with a similar diameter to that of the connecting pipe inside diameter. Fluoropolymer lined valves have a one-piece disc/shaft. The disc rotates 90 degrees, fully closing against a full elastomer or fluoropolymer seat for a tight shutoff. The shaft passes through the center of the body. Concentric design meets the pressure requirements of most plastic or composite pipe systems. Valves are bidirectional because pressure resistance is the same with valve installed in either flow direction. Although the disc is in the center of the flow stream, because it can be relatively thin, concentric design produces lower pressure drops. The full elastomer seats extend to cover the valve faces contacting the pipe flanges. The valve body is non-wetted.

Type 71 valves are “double offset”. The shaft axis is offset from the valve centerline between valve flange faces AND offset from pipe and valve’s centerline. The disc lifts up and away from the valve seat rather than squeezing into it. This means the seat can be a relatively thin ring shape. Because the disc is not squeezing into the seat, shaft torques is low, requiring smaller electric or pneumatic actuators. Type 71 is bidirectional but has a preferred flow direction for the tightest closure. The design requires a thicker disc than concentric, producing higher pressure drops.

Chemline offers FRP low leakage damper valves up to 96” /2400 mm. They have no elastomer seat but are designed for minimum gas leakage due to tight tolerances on the disc/body mating surfaces.

How are Butterfly Valves connected to piping?

Wafer body butterfly valves fit between mating flanges. Bolt holes in the valve body allow the bolts or studs to pass through and serve to center the valve properly for a good seal against mating flange faces.

Lug body valves are available in the ChemValve and Hybrid models. Flange bolts are threaded into the valve body from both sides. No nuts are used. Lug
bodies allow the valve to hold full pressure on one side of the piping while the other flange is removed. Equipment such as heaters, filters, pumps, etc. located
between lug body valves may be removed and maintained while system pressure is maintained.

Valve Specification Guide

Valve Specification Guide

Engineering specifications are crucial as they provide precision, clarity, quality assurance and compliance in your projects. Download to save you time and assure accuracy in your specifications.

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Valve Specification Guide

Chemical Resistance Guide

Corrosion resistance is an important factor in selecting the right material of construction for valves, pipe, tubing, fittings and more. Designed to easily navigate, this guide can be downloaded for easy reference.

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Materials of Construction Cover Photo

Materials of Construction

Understanding materials of construction is essential to the accurate selection of valves, pipe, tubing, fittings and more. Designed to easily navigate, this guide can be downloaded for easy reference.

Download here >

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