Showing posts with label Cv. Show all posts
Showing posts with label Cv. Show all posts

Sunday, April 29, 2012

Cv Flow Factor - Flow Coefficient for Valves

Flow Factor sells Solenoid valves, Jet Pumps and Control Valves.

The Flow Coefficient or Flow Factor is used to size and compare the flow rate through valves and other devices used for moving liquids and gases.



The flow coefficient - Cv - let us compare flow capacities of valves at different sizes, types and manufacturers. The flow coefficient is in general determined experimentally and express the flow capacity in imperial units - GPM (US gallons per minute) of water that a valve will pass for a pressure drop of 1 lb/in2 (psi).

The flow factor - Kv - is also in common use, but express the capacity in SI-units.

The flow coefficient - Cv - required for a specific application can be estimated by using specific formulas for the different fluids or gases. With the estimated Cv value - the correct valve can be selected from the manufacturers catalogues.

In more practical terms, the flow coefficient Cv is the volume (in US gallons) of water at 60°F that will flow per minute through a valve with a pressure drop of 1 psi across the valve.
The use of the flow coefficient offers a standard method of comparing valve capacities and sizing valves for specific applications that is widely accepted by industry.




Flow Coefficient - Cv - for Liquids

For liquids the flow coefficient - Cv - expresses the flow capacity in gallons per minute (GPM) of 60oF water with a pressure drop of 1 psi (lb/in2).

Flow expressed by volume

Cv = q (SG / dp)1/2         (1)
where
q = water flow (US gallons per minute)
SG = specific gravity (1 for water)
dp = pressure drop (psi)

C_v = F \sqrt{\dfrac{SG}{\Delta P}}



Flow Coefficient - Cv - for Air and other Gases

Note! - there is a difference between critical and non critical pressure drops. 

For critical pressure drop, where the outlet pressure - po - from the control valve is less than 53% of the inlet pressure - pithe flow coefficient can be expressed as:
Cv = q [SG (T + 460)]1/2/ 660 pi         (5)
where
q = free gas per hour, standard cubic feet per hour (Cu.ft/h)
SG = specific gravity of flowing gas gas relative to air at 14.7 psia and 60oF
T = flowing air or gas temperature (oF)
pi = inlet gas absolute pressure (psia)

 For non critical pressure drop, where the outlet pressure - po - from the control valve is greater than 53% of the inlet pressure - pi, the flow coefficient can be expressed as:
Cv = q [SG (T + 460)]1/2/ [1360 (dp po)1/2]         (5b)
where
dp = (pi - po)
po = outlet gas absolute pressure (psia)

Specific Gravities of common materials and mediums

Alcohol0.82
Mercury13.95
Paraffin0.80
Petrol0.72
Water (4oC)1.00
Sea water1.02
Aluminum2.72
Brass8.48
Cadmium8.57
Chromium7.03
Copper8.79
Cast iron7.20
Lead11.35
Nickel8.73
Nylon1.12
PVC1.36
Rubber0.96
Steel7.82
Tin7.28
Zinc7.12
Acetylene0.0017
Dry air0.0013
Carbon dioxide0.00198
Carbon monoxide0.00126
Hydrogen0.00009
Nitrogen0.00125
Oxygen0.00143



www.flowfactor.com
866-360-9830

Sunday, November 14, 2010

Parker Solenoid Valves ~ Fluid Control

Parker Fluid Control Division is a world-wide market leader of solenoid valves that control motion, flow and pressure.

With manufacturing facilities strategically placed around the world we are prepared to meet your needs wherever they may be. Our facilities located in U.S.A, Brazil, Italy, Switzerland and South Korea are equipped with a complete staff of experienced design engineers permitting rapid completion of customized valve designs for specific user requirements. Also, each facility has well equipped evaluation and testing laboratories to ensure proper valve operation, long cycle life, and optimum reliability of the product for the application.

With sales affiliates worldwide, an extensive distribution network, and broad product breadth, Parker Fluid Control Division is in a unique position to service the world’s requirements for solenoid valves.

Parker Fluid Control product line consists of; Gold Ring™, Skinner Valve™, Sinclair Collins®, Lucifer™ and Jackes Evans™. These product lines make Parker Fluid Control Division, the leading supplier of products controlling motion, flow and pressure.


Parker Fluid Control products have been designed to offer customers the ultimate in performance, versatility and quality. Every valve is engineered for optimal operation, is constructed with modern machinery that uses stringent processes to provide our customer with a quality driven product. Parker Fluid Control truly has a world class product offering.

Compatible Fluids
Lubricated Air, Non-Lubricated Air, Inert Gases, Water, Hydraulic Fluids, Petroleum Products and additional fluids compatible with materials of construction. Use of non-lubricated gaseous media will substantially limit valve life.

2 WAY Valves have two ports, an inlet and outlet. The media is turned off and on but the solenoid, in either a normally open or normally closed configuration.

2 WAY ANTIWATER HAMMER VALVES

2 WAY DIRECT ACTING VALVES

2 WAY DIRECT LIFT VALVES

Parker Fluid Control's Direct Lift valves are designed to have the plunger directly open or close the valve as the seating disc is attached to the plunger. These valves are used in a variety of applications including: Material Transfer, Molding, Vending Machines, Instrumentation, Welding Equipment, Water Treatment Systems, Spray Equipment, Dental Equipment, Laundry Equipment, Food Processing Machinery.

2 WAY HIGH PRESSURE VALVES

Parker Fluid Control High pressure line is designed to meet ratings as high as 3000 psi. The High pressure line is used in a variety of applications including: Blow Molding, Compressors, Car Washer Equipment and Pumps.

2 WAY INTRINSICALLY SAFE

Parker Fluid Control's intrinsically safe valve offering provide a number of significant performance advantages: Low-PowerConsumption; Low Temperature Rise; a Wide Range of Sizes; a Variety of Mounting Possibilities; Media Compatibility; a Wide Selection of Options; and Watertight Construction. The intrinsically safe solenoid valves have approvals for use in the United States and Canada in hazardous classifications for Classes I, II, III, Division 1 and 2, and in the United Kingdom for Division 0, 1 and 2. In Europe our valves are approved according to CENELEC standards.

2 WAY PILOT OPERATED VALVES

Parker Fluid Control's pilot operated valves are used in a variety of applications including: Automated Systems, Dispensing Systems, Instrumentation, Welding Equipment, Restaurant Equipment, Food Processing Machinery, Water Treatment Systems and Laundry Equipment.

2 WAY REMOTE PRESSURE OPERATED VALVES

2 WAY STEAM VALVES

Parker Fluid Control's steam valves are used in a variety of applications including: Dry Cleaning, Steam Irons, Steam Baths,Autoclaves, Molding, Steam Atomization,Sterilizers and Laundry Equipment.

3 WAY SOLENOID VALVES can come in three configurations, normally open, normally closed and universal. Int he universal configuration, the valve can be used for directional control. Usually the NO or NC valves are used to operate cylinders or other air actuated devices. The valves can have voltages of 120/60, 24/60, 240/60, 480/60, 12vdc, 24vdc, 120vdc, 240vdc. Pressure ratings from 0 to 3000 psi.

3 WAY ACTUATION VALVE

Parker Fluid Control's valve actuation product offering includes a variety of three- and four-way valves designed with unique features and options enhancing their performance, operational reliability anda pplication versatility. The Series includes All-Ports-In-Body valves, Intrinsically Safevalves, Quick Exhaust valves, Direct Mount valves with NAMUR interface, Ultra Low-Power valves, along with a host ofaccessories and options. In addition, to satisfy the most stringent environmental demands, most valves are available in a choice of body materials including brass, stainless steel, and aluminum, as well as avariety of elastomeric seals.

3 WAY DIRECT ACTING VALVES

3 WAY INTRINSICALLY SAFE

Parker Fluid Control's intrinsically safe valve offering provide a number of significant performance advantages: Low-PowerConsumption; Low Temperature Rise; a Wide Range of Sizes; a Variety of Mounting Possibilities; Media Compatibility; a Wide Selection of Options; and Watertight Construction. The intrinsically safe solenoid valves have approvals for use in the United States and Canada in hazardous classifications for Classes I, II, III, Division 1 and 2, and in the United Kingdom for Division 0, 1 and 2. In Europe our valves are approved according to CENELEC standards.

3 WAY MANUAL RESET VALVES

Parker Fluid Control's manual reset solenoid valves are designed for use in emergency. These valves are designed so that once they are actuated, the valve will not change its operating position, unless it is manually reset.

3 WAY PILOT OPERATED VALVES

Parker Fluid Control's pilot operated valves are used in a variety of applications including: Automated Systems, Dispensing Systems, Instrumentation, Welding Equipment, Restaurant Equipment, Food Processing Machinery, Water Treatment Systems and Laundry Equipment.

3 WAY QUICK EXHAUST VALVES

Parker Fluid Control's quick exhaust valves are designed to provide large exhaust orifice for quick exhaust. Increased exhaust capacity significantly reduces cycle time for single acting spring return actuators.

3 WAY REMOTE PRESSURE OPERATED VALVES

4 WAY SOLENOID VALVES are used to operate cylinders and double acting cylinders. 4-way valves can have 4 or 5 ports. One is the pressure inlet port and the remainder are the cylinder and exhaust ports.

4 WAY ACTUATION VALVES

Parker Fluid Control's valve actuation product offering includes a variety of three- and four-way valves designed with unique features and options enhancing their performance, operational reliability and application versatility. The Series includes All-Ports-In-Body valves, Intrinsically Safevalves, Quick Exhaust valves, Direct Mount valves with NAMUR interface, Ultra Low-Power valves, along with a host ofaccessories and options. In addition, to satisfy the most stringent environmental demands, most valves are available in a choice of body materials including brass, stainless steel, and aluminum, as well as avariety of elastomeric seals.

4 WAY DIRECT ACTING VALVES

4 WAY INTRINSICALLY SAFE

Parker Fluid Control's intrinsically safe valve offering provide a number of significant performance advantages: Low-PowerConsumption; Low Temperature Rise; a Wide Range of Sizes; a Variety of Mounting Possibilities; Media Compatibility; a Wide Selection of Options; and Watertight Construction. The intrinsically safe solenoid valves have approvals for use in the United States and Canada in hazardous classifications for Classes I, II, III, Division 1 and 2, and in the United Kingdom for Division 0, 1 and 2. In Europe our valves are approved according to CENELEC standards.

4 WAY PILOT OPERATED VALVES

Parker Fluid Control's pilot operated valves are used in a variety of applications including: Automated Systems, Dispensing Systems, Instrumentation, Welding Equipment, Restaurant Equipment, Food Processing Machinery, Water Treatment Systems and Laundry Equipment.

Purchase valves at Flow Factor.

866-360-9830