Valves & Actuation

Spears Butterfly Check Valves: Automatic - PVC \ EPDM
Butterfly Check Valves: Automatic - PVC \ EPDM

Design Features
This multi-purpose check valve provides an extremely low profile and very quick response to back flow without slamming. The special design requires no more space then a piece of pipe, and incorporates a flexible elastomer seal for long life, and is suitable for mounting in any position for greater versatility.
Technical Information
2" through 8" sizes are rated for 150 psi @ 73°F, 10" and 12" sizes are rated for 100 psi @ 73°F. As a general guideline, opening and closing pressures will range from .2 to .5 psi for horizontal applications. Opening pressures tend to decrease in large size valves. Valves installed in vertical up-flow applications will require slightly higher pressures.
Features
• PVC or CPVC construction - no metal components     • Quick response shut-off in any position     • Field replaceable Flex-Seal - EPDM or Viton®
• Assembled with silicon-free, water soluble lubricants     • Available with either spigot, flanged, grooved pipe or male threaded ends
• Sizes now available to 24" pipe size - call for information

Spears Diaphragm Valves: Manually Actuated - CPVC \ EPDM
Diaphragm Valves: Manually Actuated - CPVC \ EPDM

This full-featured valve is engineered to provide accurate throttling control and shut-off for industrial, chemical and water treatment applications, as well as the handling of liquids with suspended solids, viscous fluids and slurries. Weir-type design utilizes a choice of elastomeric diaphragms with non-rising stem and built-in position indicator. Strong buttress thread, true union style end connection allows ease of installation and service. Available in IPS sizes 1/2” through 2” with socket and threaded end connectors. Heavy-bodied Schedule 80 PVC or CPVC smooth-wall construction provides extra strength, superior chemical and corrosion resistance while maximizing fluid flow. Choice of high-grade, abrasion-resistant EPDM, Viton® or elastomer-backed PTFE-laminated diaphragm allows application specific selection for optimum chemical resistance.
Features
• 235 psi @ 73°F (for complete size range)  • Built-in mounting holes for self-tapping screws  • Rugged construction with strong buttress threads  • Available with EPDM, Viton® or PTFE diaphragm  • Dual end connectors (socket and thread) on PVC and CPVC  • SR threaded ends - SS-reinforced threaded end connectors

Spears Diaphragm Valves: Manually Actuated - PVC \ EPDM
Spears Diaphragm Valves: Manually Actuated - PVC \ EPDM

This full-featured valve is engineered to provide accurate throttling control and shut-off for industrial, chemical and water treatment applications, as well as the handling of liquids with suspended solids, viscous fluids and slurries. Weir-type design utilizes a choice of elastomeric diaphragms with non-rising stem and built-in position indicator. Strong buttress thread, true union style end connection allows ease of installation and service. Available in IPS sizes 1/2” through 2” with socket and threaded end connectors. Heavy-bodied Schedule 80 PVC or CPVC smooth-wall construction provides extra strength, superior chemical and corrosion resistance while maximizing fluid flow. Choice of high-grade, abrasion-resistant EPDM, Viton® or elastomer-backed PTFE-laminated diaphragm allows application specific selection for optimum chemical resistance.
Features
• 235 psi @ 73°F (for complete size range)  • Built-in mounting holes for self-tapping screws  • Rugged construction with strong buttress threads  • Available with EPDM, Viton® or PTFE diaphragm  • Dual end connectors (socket and thread) on PVC and CPVC  • SR threaded ends - SS-reinforced threaded end connectors