Series circuits unload the pump flow to tank when all 4-ways are in the center position. Pump flow passes through each valve making the pressure drops additive. Series circuits have the capability, when energizing two valves, of positive motion of two functions by using exhaust flow from the upstream actuator. Cautions to observe when applying valves in series circuits are pressure and flow intensification from different cylinders and the effects of back pressure on upstream functions.
Parallel Circuit Valve- By positioning the valve with the cylinder ports up and the upstream pressure port (pressure port without counterbore for an O-ring) towards you, solenoid "A" and cylinder port "A" will be on the left side. When solenoid "A" is energized flow will be from "P" to "B". Parallel circuits have pressure blocked in neutral and are generally used with pressure compensated pumps or some type of unloading valve. Parallel circuits do not have the problems of pressure and flow intensification but will not insure motion of more than one actuator when two valves are energized at the same time.Response time is interval between initiation of electrical signal to the solenoid and the appearance (or loss) of pressure in cylinder port. Information provided in item description has been taken from the Parker hydraulics MD04/MD06 service bulletin. All Photos Are Authentic (Exactly what you will be receiving). This item is in the category "Business & Industrial\Hydraulics, Pneumatics, Pumps & Plumbing\Valves & Manifolds\Other Valves & Manifolds". The seller is "quality_clean_quick" and is located in this country: US. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech Republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, Korea, South, Indonesia, Taiwan, South Africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi Arabia, United Arab Emirates, Qatar, Kuwait, Bahrain, Croatia, Republic of, Malaysia, Brazil, Chile, Colombia, Costa Rica, Dominican Republic, Panama, Trinidad and Tobago, Guatemala, El Salvador, Honduras, Jamaica, Antigua and Barbuda, Aruba, Belize, Dominica, Grenada, Saint Kitts-Nevis, Saint Lucia, Montserrat, Turks and Caicos Islands, Barbados, Bangladesh, Bermuda, Brunei Darussalam, Bolivia, Ecuador, Egypt, French Guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman Islands, Liechtenstein, Sri Lanka, Luxembourg, Monaco, Macau, Martinique, Maldives, Nicaragua, Oman, Peru, Pakistan, Paraguay, Reunion, Vietnam, Uruguay.