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Frequently Asked Questions

General

Q: Will PacSeal Hydraulics ship internationally?
A: Absolutely. While we have global distributors, we will certainly accept orders from customers in all corners of the world when terms and conditions have been met. This is typically done through your freight forwarder.

Q: What hydraulic fluid do you recommend?
A: The hydraulic fluid to be used depends on the application, temperature range (maximum and minimum expected operating temperature), and environmental regulations that may require water-based fluids. PacSeal’s hydraulic control components will work with virtually any working fluid. However, for water-based hydraulic fluids (e.g. water glycol) special alloy seal rings may be required to withstand the higher wear caused by reduced lubricity. Water-based hydraulic fluids generally have a significantly lower viscosity grade (lubricity) in comparison with synthetic or conventional hydraulic oils. This reduction in viscosity/lubricity will cause higher wear and potentially galling on the sealing components, which will reduce the service life dramatically. This is true for any hydraulic valve on the market. Contact us today to determine the right solution for your application.


SV Directional Control Valves

Q: Can I order repair kits for my SV Directional Control Valve?
A: Yes. Please see SV Valve Accessories and Repair Kits and scroll to find O-ring, Seal, Minor Repair, or Major Repair Kits for your specific valve.

Q: Are PacSeal SV Repair Kits compatible with Barksdale Shear-Seal Valves?
A: Yes. Please contact PacSeal Hydraulics with your model and size and we will direct you to the correct Repair Kit for replacement.

Q: Are PacSeal Hydraulics’ Valves 100% made in the USA?
A: Yes! From sourcing raw material to shipment, all manufacturing and production takes place in Southern California.

Q: What is the Cv value for the valves?
A: Cv is the valve sizing flow coefficient that is determined experimentally for each size and style of a valve with water at standard operating conditions. Thus, a valve’s Cv can be expressed as the number of gallons of water per minute (GPM) at 60°F that can flow through the valve in one minute with a difference in pressure across the valve as one pound per square inch (psi). Cv is directly proportional to the valve’s flow rate (Q) and specific gravity (SG) of the fluid but inversely proportional to the pressure drop DP, which can further be expressed by the following equation:

the flow coefficient equals Q times the square root of S times G over delta P

This coefficient increases with the size of the SV Directional Control Valve and dictates the pressure drop across the valve given the system’s supply flow rate. See definitions of other industry terms in our Glossary.

Q: Can the SV manual handle be re-oriented?
A: Yes. The handle can be rotated 180° by removing the shaft nut and washer. For a smaller footprint handle that accommodates right and left-handed users, try our OEM Wing Handle that may be ordered as a spare part.

Q: Can actuator cylinders be installed on an existing valve?
A: Yes. Retrofitting is simple and can be done so by purchasing an actuator cylinder with a bracket kit. Please see the valve’s maintenance instructions for appropriate disassembly and assembly instructions.

Q: Can SVX integral actuators be installed on an existing valve?
A: No. To create the most efficient and reliable actuator and valve assembly, the shaft and housing are unique for this combination. Please call us today for further guidance.


KR Pressure Regulators

Please read our KR Pressure Regulator system integration guidelines, operation, and troubleshooting page before installation and troubleshooting.

Q: Can I order repair kits for my KR Pressure Regulator?
A: Yes. Please see KR Pressure Regulator Accessories and Repair Kits and scroll to find O-ring, Seal, Minor Repair, or Major Repair Kits for your specific regulator.

Q: Are PacSeal KR Repair Kits compatible with Barksdale Shear-Seal Pressure Regulators?
A: Yes. Please contact PacSeal Hydraulics with your model and size and we will direct you to the correct Repair Kit for replacement.

Q: Are PacSeal Hydraulics’ Pressure Regulators 100% made in the USA?
A: Yes! From raw material to shipment, all manufacturing and production takes place in Southern California.

Q: What is the Cv value for the pressure regulators?
A: Cv is the valve sizing flow coefficient that is determined experimentally for each size and style of a valve with water at standard operating conditions. Thus, a valve’s Cv can be expressed as the number of gallons of water per minute (GPM) at 60°F that can flow through the valve in one minute with a difference in pressure across the valve as one pound per square inch (psi). Cv is directly proportional to the valve’s flow rate (Q) and specific gravity (SG) of the fluid but inversely proportional to the pressure drop DP, which can further be expressed by the following equation:

the flow coefficient equals Q times the square root of S times G over delta P

This coefficient increases with the size of the KR Pressure Regulator and dictates the pressure drop across the regulator given the system’s supply flow rate. See definitions of other industry terms in our Glossary.

Q: Why won’t my KR Pressure Regulator adjust to a new pressure?
A: When the set pressure on a spring operator is being changed or adjusted, the outlet needs to be briefly opened and closed a few times to allow the operator and pressure to stabilize. This can be achieved by operating a (downstream) manifold control valve or installing a separate, much smaller valve directly on the outlet line near the KR. The control valve should be briefly opened and closed (one to three times) after the KR has been adjusted; this will stabilize the pressure reading.

Q: How do I improve my KR Pressure Regulator’s adjustment sensitivity?
A: The adjustment sensitivity is related to the industry coined term, deadband. Deadband is the difference between the set pressure and the outlet pressure that triggers the KR to open or vent and reset. DB is a function of the friction force between the seal rings and the flow plates. As the outlet pressure slowly changes, the device will not react to the pressure change until the friction has been overcome. To reduce the deadband for greater sensitivity, an “L”, “D”, “H”, or “W” model is needed. The hydraulic pilot (“P” model) is the most sensitive KR that we offer and can achieve a deadband range of 0-100 psi. These models have a larger piston diameter which provides a larger resultant force to overcome the internal friction forces in smaller incremental adjustments. Call us today to discuss options for a new KR pressure regulator or a conversion kit.

Q: How do I prevent the KR Pressure Regulator from chattering/hammering?
A: Chattering and hammering of the KR is more than likely caused by inadequate flow capacity downstream the pressure regulator. Consider increasing the outlet pipe size, reducing restrictions and bends in the outlet piping, and/or installing an accumulator in parallel with the outlet piping.


Bladder Accumulators

Q: To what pressure should I precharge my bladder accumulator?
A: The precharge depends on the required volume and pressure of the system as well as the application. Too low or too high of a precharge can damage the bladder. For all applications, the precharge pressure should be at least 30% of the maximum system pressure. For shock absorption, the precharge is usually set to about 65% of the system pressure. For auxiliary power supply, pump supplementation, or leakage compensation it is recommended that the precharge be set between 80-90% of the minimum system pressure. For reducing line stock, the precharge should be set to about 50% of the minimum system pressure. Nevertheless, it is solely the responsibility of the user to determine the correct precharge pressure and only a qualified service technician should perform the precharge. Contact us for further recommendations.

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