Industrial Ball Valves / 3700 Flanged & Grooved Ball Valves

Cast iron ball valve with PFA* fused ball

Model 3700 features an NSF/ANSI 61 and NSF/ANSI 372 certified cast iron body and the same PFA* fused ball as the 4000 series. It inhibits buildup that accumulates on unprotected ball surfaces and prevents premature valve failure. The same ANSI B16.10 end-to-end dimensions as flanged gate and plug valves makes this one an easy decision.

Model 3700 is ideally suited for backflow prevention devices and potable water applications. All model 3700 valves are rated 200W at 200°F, and are available in full port from sizes 2" through 8". With no disc or obstruction in the line, model 3700 easily out-performs any butterfly valve.

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Installation Instructions


  • Certified to meet the requirements of NSF/ANSI 61 and NSF/ANSI 372
  • Zero flow obstruction in the open position
  • Zero leak rate in the closed position
  • Easy to operate


Typical gate valve

Model 3700

Same End-to-End Dimensions as Model 3700 (ANSI B16.10) Same End-to-End Dimensions as Class 125 or 150 Gate Valve (ANSI B16.10)
Unprotected Metal Gate
–Notorious as a magnet for buildup and mineral deposits, making full shutoff impossible. Should come with a cheater bar.
PFA*-Fused Ball
–Prevents Calcium, Lime, or any other buildup common in water applications, which often leads to premature valve failure.
Heavy & Awkward
–Requires "Big Joe" to Install
–Typical 3" Gate Valve = 72 lbs.
–Typical 6" Gate Valve = 197 lbs.
Lightweight & Compact
–Easy to Install
–3" 3700 = 35 lbs.
–6" 3700 = 113 lbs.
Certified to meet the requirements of NSF/ANSI 61 and NSF/ANSI 372
Contains Bronze parts...which contain Lead. (Lead has been shown to cause birth defects and damage to the nervous system- even in small doses) Positive Shut-off (Exceeds Clas VI)

PFA* Fused Ball

The 4000 and 3700 Series feature a PFA* fused ball that is more durable, less succeptible to accumulating buildup and longer lasting than an ordinary unprotected ball. This adds to a long list of advantages over other types of valves.

With the help of Dupont, we developed a process to impregnate PFA* .008" into a solid metal ball. An additional .004" is added electrostatically for smoothness. Since the PFA* becomes part of the metal, it can't flake, chip, or peel off.

The corrosion and chemical resistance of PFA* has been recognized around the world. With the introduction of this valve we present an affordable (same price as most gate valves) ball valve that will outlast any unprotected metal valve in any application.

The lubricity of our PFA* ball allows for lower torque ratings in any application, making it easier to turn and require a smaller, less expensive actuator.

We offer a complete line of actuators, gear operators and operating nuts for the 4000 series. Our unique PFA* fused ball and lower operating torques make the 4000 series an effective alternative to cast iron gates, carbon steel ball valves and plug valves. The four-bolt actuator mounting pad is ideal for applications requiring automation.


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*PFA is an ingredient commonly branded as Teflon®.