Annular flow valve SV-FA

Transcription

1

2 INDEX 1. INTRODUCTION 1.1 SOLUTIONS Annular Flow Valve s technical benefits Functions and operations manual Manufacturing range 4 2. PARTICULARS Material and coverings Standard version Total dimension and weight Manual Version Motorized Version 7 3. Applicable patterns Testing Hydraulic testing Product testing Pattern compliance Marking 8/9 4. Valve Selection Hydraulic particulars 10/11/ Cavitation Handling Instructions Storage Installation Maintenance 14 PICTURES DURING THE MANUFACTURING/INSTALLATION PROCESS 15 PICTURES OF THE ANNULAR FLOW VALVES READY FOR USING 16 02/16

3 1. INTRODUCTION 1.1 SOLUTIONS Annular Flow Valve s technical benefits Smoother flow with less noise and vibration; Lower charge loss when compared to the self-operating valves; Possibility to work with large pressure reductions without being affected by cavitation effects; Low-operating torque due to a hydraulically balanced shutter; High control accuracy and operational range. Application: Water (raw or treated) Main Characteristics: High working range;positioning accuracy; High capacity; pressure reductions; resistance to cavitation; Low noise and vibration generation; 36 months warranty. 03/16

4 1.2 Functions and operations manual The main characteristic of the annular flow valve () is the ability to modulate the flow in a linear way, even in the presence of high pressure differentials. The equipment can operate with either treated or raw water (respecting the limits of dimensions and the suspended solid material amounts) within the maximum speed limits of 16,4 f/s and the fluid temperature of 104 ºF. There are several types of trigger, being able to perform multiple functions, if connected to a control system. The most common functions are: Free outflow Reservoir level control Flow control Pressure reduction/sustenance The annular flow valves () controls the desired hydraulic variable through a shutter s axial movement that is triggered by a lever, labeled on the extremities, and connected to a rod mechanism. The fluid that goes through the valve is channeled into a circular section passage that varies gradually, throughout the way on the valve s interior. The valve s internal profile is designed to optimize the hydrodynamical profile and to minimize cavitation. Besides that, for more extreme conditions, the valve can be equipped with an anti-cavitation cylinder. 1.3 Manufacturing Range The annular flow valves (), manufactured by SOLUTIONS Inc., can be manufactured with a nominal diameter (ND) from 4 up to 63 inches and with a nominal pressure (NP) of 125/150/300 pounds, and it also can include the following features: - Manual activation - Electric actuator - Cylinders It is also available with buoy and a counterbalance piece. Other activation types are available, upon request. 04/16

5 2. PARTICULARS 2.1 Material and coverings Standard Version 05/16

6 2.2 Total dimension and weight Manual version *Don t hesitate to contact us about other sizes and pressure classes. 06/16

7 2.2.2 Motorized version *Don t hesitate to contact us about other sizes and pressure classes. 07/16

8 3. Applicable patterns 3.1 Testing Hydraulic testing Every annular flow valve () is subject to the hydrostatic tests, according to the ISO 5208 certification: - Body 1,5 times the nominal pressure - Sealing: 1,1 times the nominal pressure Covering Control The covering is controlled through the execution of the following tests: Layer thickness control; Layer continuity control (Holiday test); Impact resistance testing; Solvents resistance test (MIBK). 3.2 Pattern Compliance Tests: ISO 5208 Flange drilling template: EN ISO Activation systems couplings: ISO 5210 for manually actuated valves; ISO 5211 for valves actuated by actuators; 08/16

9 3.3 Markings At the body of the product, following the EN19 patterns: Nominal diameter (ND) in inches; Nominal pressure (NP) in bar; Ductile iron type; Manufacturer logo; Flow direction; Model code; Date of foundry. On the tag, following the EN19 patterns: Nominal diameter (ND) in inches; Nominal pressure (NP) in bar; Pressure class; Closure direction; Product s code; Manufacturer logo; 09/16

10 4. Valve Selection In order to obtain precise sizing and the desired performance of the equipment, it is necessary to understand and follow the hydraulic parameters below: Upstream hydrostatic pressure (consists of the upstream pressure while the valve is closed); Upstream pressure (P in) and downstream pressure (P out) with maximum flow rate (Q max); Upstream pressure (P in) and downstream pressure (P out) with minimum flow rate (Q min); It is also important to know the valve s function: ( ) Keep constant pressure; ( ) Keep constant flow; ( ) Control any hydraulic variables at either an upstream or downstream level; ( ) Others... Besides, it is necessary to make sure the sizing is properly setup, to assure that the valve s top speed is equal or less than 16,4 f/s, and that the temperature remains between 32ºF and 104ºF. These parameters allow us to properly size the valve and to evaluate whether or not the anticavitation cylinder is required. Note: For specifications on the motorized version and characteristics of the actuator please contact us at contato@solutionsequipamentos.com. 10/16

11 4.1 Hydraulic particulars Charge losses can be calculated using the below formula: Formula description: = Charge loss (m.c.a) = Charge loss coefficient (dimensionless extracted from diagram 1) V = Nominal speed (ft/s) g = Gravity acceleration 32.1 ft/s2 *With the anti-cavitation cylinder 11/16

12 Afterwards, it is possible to determine the flow rate Q (ft3/h): Kv = flow coefficient (diagram 2), which corresponds to the flow being measured in ft3/h at 68 ºF, which causes a pressure drop of 3ft on the water column (10,2 correction factor in meters). 12/16

13 4.2 Cavitation To estimate the risk of cavitation we can use the following graphic with the upstream and downstream values of the equipment. There are three kinds of situations, depending on the use: Green area: No cavitation problems; Yellow area (Areas with large waste of energy and low contrary pressure): To prevent the quick damage that can be caused by cavitation, the valve must be equipped with an anti-cavitation cylinder, made of stainless steel (Multiple models available: K20, K50, K100, K150) which, when attached to the shutter, elevates the valve s performance on these conditions, increasing the product s lifecycle. Red area: The valve cannot operate. Example: (P in) = 14 bar (P out) = 3 bar In this case, the standard version (without the cylinder), works on the yellow area of the graphic. In order to operate safely the K100 type anti-cavitation cylinder is required. 13/16

14 5. Handling instructions: 5.1 Storage The annular flow valve () must be stored, if possible, warehouses, free from weather factors. The sealings must not be in direct contact with dust or excessive particulates atmosphere. Note: Maximum storage temperature ºF 5.2 Installation The flow indication, marked on the valve s body, must be followed. Note: Reverse flow can be accepted only in cases where the valve is completely opened or if there is no need of adjustments. It is advised that a demountable joint is installed, to make the installation and maintenance operations easier. For more detailed information please refer to the Operational and Maintenance manual. 5.3 Maintenance Any eventual maintenance to the valve must be executed when the system is completely drained out, to assure the operator s safety. Every mechanical part subjected to wear caused by friction is manufactured with self-lubricating material, which does not require any particular maintenance. However, to guarantee the equipment s high performance, the valve needs to function at least once a year, working its full cycle (open/close). For more detailed information please refer to the Operational and Maintenance manual. 14/16

15 15/16

16 16/16