Brochure

ManualsBrandsSpears ManualsPVC Ball Valves2" Socket End Connector Set for PVC True Union Ball Valves (Pack of 2)

Thermoplastic Valves Product Guide & Engineering Specifictions

Valve Types

Page 713 Suitable for Oil-Free air handling to 25 psi, not for distribution of compressed air or gas Spears

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ISO 9001 Certified Design & Manufacturing Quality Program

Spears

Quality Management System is certified to the strict requirements of ISO 9001 for optimum control of product

design, development, and production. Quality improvement and customer satisfaction are central to each stage of producing

Spears

valves from conception through final delivery.

Development & Testing

The foundation of Spears

products is development, testing, and more testing. Spears

valve development combines proven

experience with structural testing at the design level. Materials and design are correlated in computer engineering stress analy-

sis to yield the optimum structure and function of each valve component. Resulting products are then subjected to numerous

tests for performance validation of dimensional stability, sealing capability, hydrostatic burst pressure, operational torque,

flow capacity, vacuum application suitability and cyclic pressure analysis. Once approved, production valves and components

are routinely subjected to dimensional, functional and burst pressure verification tests.

100% Sealing Capability Verification

All Spears

ball valves are air-tested for 100% verification of

positive sealing during the manufacturing process.

Hydrostatic Burst Pressure Verification

Representative valve samples are routinely subjected to an

internal hydrostatic pressure of 3.2 times their designated

pressure rating in a 60-70 second test per ASTM D 1599

during each production run.

Spears

Valve Innovations

Not all plastic valves are the same. Spears

valves incorporate several unique features not found in competitive products. The

following are a few examples of Spears

innovative improvements to conventional valve designs.

Spears

Safe-T-Shear

Stem

This important SAFETY FEATURE was developed to help

prevent line fluids from leaking out in the event of ball valve

stem damage. Engineered for high strength, the stem incor-

porates a special shear point to control accidental breakage.

Over-torquing breaks occur above the stem O-ring leaving

the seal intact until repair or replacement can be made.

Spears

Heavy Buttress Thread Components

When it comes to handling the hydraulic force of high internal

pressures, the brute strength of the buttress thread is clearly

the best. Its broad bearing surface with an angular backing

provides greater thrust support than conventional square-cut,

ACME-type threads commonly used in similar ball valve

components. All Spears

Ball Valve union nuts and seal carri-

ers are designed with buttress threads for greater strength and

pressure handling capabilities — one of the strongest in the

plastic valve industry!

Low Torque, Low Wear Butterfly Valve Seats

Spears

Butterfly Valves provide the lowest operating torque

available. Sealing contact between disc and seat takes place

only at the close of the valve, allowing free travel through

the full range of opening. This unique design eliminates seat

creep, extrusion and wear typical with conventional liner-type

seats. Exclusive design interlocks seat and body to prevent

washout or blowout.

Vacuum Service

Validation of Spears

valves rated for vacuum service is

determined from 1-hour tests at 26 in. Hg vacuum with less

than 1 in. Hg loss. A vacuum lubricant should be applied

to elastomer-seated valve seats, such as Spears

Butterfly

Valve or True Union Ball Check Valve, to prevent the seat

from drying out in vacuum service applications.

Flow Balanced Ball Check Valves

Improper ball check valve design can significantly restrict

flow, create ball-chatter and even result in reverse ball trav-

el and open flow shutoff! As a result of extensive design

testing, Spears

has engineered the internal flow charac-

teristics of the True Union Ball Check Valve to optimize

fluid transmission and virtually eliminate ball-chatter.

Special Reinforced (SR) Female

Plastic Threads

This patented Special Reinforced (SR) design is one of the

most significant improvements in female plastic thread

reliability. Not just an added reinforcing ring, this unique

pre-compression design compensates for expansion forces

generated from normal tapered pipe thread joint make-up.

Radial stress is neutralized in normal installations and

contained in severe over tightening situations. Spears

Threads are available on a variety of Spears

industrial

valves using SS316 reinforcement for optimum chemi-

cal and corrosion resistance. Spears

SR Female Spigot

Adapters are also available for quick conversion of any

slip-socket style valve end connector.