At Triangle Pump Components, we prioritize our customers’ satisfaction and success. To prevent technical complications and ensure that you get the most out of your Triangle Pump Components solution, we’ve provided answers to some of the most common pump valve questions we hear from customers:
Q. What is the Net Positive Suction Head Required for the V7H?
A. This depends more on the pump than the valves. However, a minimum of 2 psi above the vapor pressure of the fluid being pumped would be an absolute minimum.
Q. Cut-off on low flow?
A. This depends on the size of the valve. Low flow (for Triplex) would be:
|1 1/2 – 15.5 GPM||2 1/2 – 52 GPM||3 1/2 – 110.5 GPM|
|1 3/4 – 37 GPM||2 3/4 – 73 GPM||3 3/4 – 185 GPM|
|2 –37.5 GPM||3 – 95 GPM||4 – 206 GPM|
Q. What are Triangle Pump Components’ material guidelines?
A. We chose 316 Stainless Steel as our standard material because it is a general purpose material surpassing any other selection in both price and performance.
316 – The molybdenum content protects against pitting and crevice corrosion. It is sensitive to abrasion, provides high resistance to corrosion in saltwater, and reduces acid in pumping situations.
17-4 – This material boasts higher strength and abrasion resistance to 304 at elevated temperatures. It’s fair in saltwater and high chloride stress but can crack with corrosion.
17-7 – Very similar to 17-4 (P.H), this precipitation hardened stainless steel material is slightly better than 316 as it is formulated for better resistance in acidic environments.
Q. Wear vs. Solids?
A. Abrasivity is a function of hardness, size, shape, size distribution, friability, and concentration. All of these things will contribute to the final viscosity of the fluid, leading to the use of “Miller No’s” and testing (ASTM STD. G75.82). As a rule, particle sizes up to 8 microns pose no problems — but no two pumping systems are alike, and determining Wear vs. Solids requires testing.
Q. Wear vs. Temperature?
A. This is usually not a factor with stainless steel valves.
Q. Wear vs. Orientation?
A. If valves are positioned to pass fluid horizontally, wear to the sleeve will be more pronounced on one side.
For answers to any other reciprocal pump valve questions you may have, contact Triangle Pump Components today»