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Thermoplastic Valves Product Guide & Engineering Specifictions
Tee-Style "Zero Dead-leg" Diaphragm Valves
Spears
®
Tee-Style “Zero-Dead-Leg” Diaphragm Valve design integrates valve and Tee-fitting
for direct branch take-off and eliminates the need for tees and reducing fittings normally
required for service drops and other tie-ins to the loop. The Tee-Style valve provides a
stronger, more compact connection enabling throttling, sampling, draining or diverting o
f
critical process fluids. The “Zero Dead-leg” design is excellent for DI water and other critical
applications. Close proximity of valve to mainline minimizes any areas of fluid stagnation
by eliminating “dead leg” that can harbor bacterial growth and other contamination.
Produced to order with Spigot, Socket & Threaded, or Special Reinforced (SR) Threaded
end connection valve sizes 1/2" through 2", and specified Tee Socket connection sizes for
virtually any mainline connection size.
Features – PVC, Low Extractable PVC & CPVC
T-Style Valve Advantages
• Chemical & Corrosion Resistant PVC, CPVC or Low
Extractable PVC materials
• Minimizes Fluid Stagnation
• Improves Branch Valve Connection Strength
• Simplifies Installation
• Suitable for Vacuum Service
(except with PTFE Diaphragms)
Sample Engineering Specification
All lateral branch valve connections shall be made using Tee-style Diaphragm Valves. All valves shall be constructed from
PVC, ASTM D 1784 Cell Classification 12454; CPVC Type IV, ASTM D 1784 Cell Classification 23447; or Low Extractable
PVC, ASTM D 1784 Cell Classification 12343. Diaphragms shall be EPDM, FKM or elastomer backed, bonded PTFE. All
valves with elastomer diaphragms shall be pressure rated to 235 psi and all valves with PTFE diaphragms to 150 psi, for wate
r
at 73°F, as manufactured by Spears
®
Manufacturing Company.
Quick-View Selection Chart
The following Base Part Numbers must be completed according to desired configuration size. Contact Spears
®
for the
appropriate Tee size x Valve size code designations to replace the “xxx” in each.
Diaphragm
Material
PVC Base Part Number
Pressure
Rating @ 73°F
(23°C)
Spigot Socket & Threaded SR Threaded
EPDM 2727ZD-xxx 2729ZD-xxx 2721ZD-xxxSR
1/2" – 2"
235 psi
FKM 2737ZD-xxx 2739ZD-xxx 2731ZD-xxxSR
PTFE, EPDM Backing 2797TZD-xxx 2729TZD-xxx 2721TZD-xxxSR
1/2" – 2"
150 psi
PTFE/FKM
Backing 2797VTZD-xxx 2739VTZD-xxx 2731VTZD-xxxSR
Diaphragm
Material
Low Extracable PVC Base Part Number
Pressure
Rating @ 73°F
(23°C)
Spigot Socket & Threaded SR Threaded
EPDM 2727ZD-xxxBL 2729ZD-xxxBL 2721ZD-xxxSRBL
1/2" – 2"
235 psi
FKM 2737ZD-xxxBL 2739ZD-xxxBL 2731ZD-xxxSRBL
PTFE, EPDM Backing 2797TZD-xxxBL 2729TZD-xxxBL 2721TZD-xxxSRBL
1/2" – 2"
150 psi
PTFE/FKM
Backing 2797VTZD-xxxBL 2739VTZD-xxxBL 2731VTZD-xxxSRBL
Diaphragm
Material
CPVC Base Part Number
Pressure
Rating @ 73°F
(23°C)
Spigot Socket & Threaded SR Threaded
EPDM 2727ZD-xxxC 2729ZD-xxxC 2721ZD-xxxCSR
1/2" – 2"
235 psi
FKM 2737ZD-xxxC 2739ZD-xxxC 2731ZD-xxxCSR
PTFE, EPDM Backing 2797TZD-xxxC 2729TZD-xxxC 2721TZD-xxxCSR
1/2" – 2"
150 psi
PTFE/FKM
Backing 2797VTZD-xxxC 2739VTZD-xxxC 2731VTZD-xxxCSR
Note: Low Extractable PVC Valves are typically used with elastomer backed PTFE Diaphragms to maintain purity in most applications.
Diaphragm Valve Features
• Multi-featured Industrial Grade
• Built-in Position Indicator
• EPDM, FKM, or Elastomer Backed PTFE Diaphragm
• 235 psi Pressure Rating @ 73°F
(150 psi for PTFE Diaphragms)
• High Impact Polypropylene Handle
• Fully Serviceable, Replaceable Components
Tee x Spigot