Air Vent Valve Selection

Transcription

1 Selection 1. TA-3 TA-3C TA-2 TA-2C TA-5 TA-5F TA TA-11 TA-11L TA-18 TA-18L TA-22 TA-22L TA-16 TA-16CVA TA-16CVS TA-16L TAV-2 TAV-3A Steam Oil ax. Working Pressure (Pa) ax. Temperature ( C) oel Page 288

2 Selection of What is an?? An air vent valve is a safety evice that ischarges air at the water supply piping in orer to avoi air relate problems in the water piping systems. s Col an hot water supply system ot water boiler Solar hot water system Other various evices Air conitioning system ot water heater appliance Pressure tank Purposes For protecting piping materials an systems from corrosion ue to air (oxygen). For preventing water splashing at faucet ue to the existence of air. For preventing noise resulte from the ingress of air into col/hot water supply systems, air conitioning systems, an other systems. For the smooth startup an stable operation of water supply an other systems/evices through air ischarge at the time of initial water conveyance. type type W/ Quick ventilation type W/ Vacuum breaker Types Discharges air in the piping continuously. Exhausts large quantity of air upon system start-up an release accumulate air continuously. Takes in air to reuce vacuum conition an releases accumulate air if any. ajor Proucts TA-3 Series TA-25 TAV-3A 289

3 Note for Selecting Discharge Amount The ischarge amount epens on the moel. Please refer to the following chart to select a moel aequate for the require ischarge amount. Air vent valve ischarge amount L/min Pa TA-3 TA-16 TA-22 Feature of Quick Exhaust echanism The ifference between air vent valves with an without quick exhaust mechanism appears uring the operation at low pressure up to.15 Pa. By exhausting large amount of air from the piping at low pressure, the valve ensures smooth initial water supply. 2 Exhaust capacity L/min (stanar conition) Pressure Pa Pressure Pa Exhaust capacity L/min (stanar conition)

4 Note for Selecting with Vacuum Breaker An air vent valve with vacuum breaker operates in the same manner as an air vent valve but has an upgrae air intake function that works when negative pressure is generate. It prevents a backflow from a system or unit to which water is supplie by promptly eliminating negative pressure. Necessity of s with Vacuum Breaker Anair vent valvehas been installe at the top of vertical water supply piping for the purpose of ischarging air. In this case, however, if the pressure insie piping rops because of temporary suspension of water supply or an accient, the pressure at the top of the vertical piping becomes negative, which may cause the phenomenon of a backflow (inverte siphon) within the builing. For this reason, the top of the vertical piping requires anair vent valve with vacuum breakerthat has both a function of introucing into the piping a sufficient quantity of air to eliminate negative pressure, an a function capable of ischarging air uner pressure. Top of vertical piping in collective housing an builings Top of vertical piping connecte to irect boosting water supply lines Pressure reucing valve for iniviual water supply Air vent valve with vacuum breaker Booster pump for water supply BP Backflow prevention equipment of pressure reucing type View about Intake Air Quantity One of the probable causes of the generation of maximum negative pressure insie water supply piping is a large water leakage ue to amage to piping. So, negative pressure no longer occurs if a larger quantity of air than this water leakage can be introuce into the piping. The air intake performance stanars of Scaninavian countries (establishe by N. Linbla, Sweish & Wastewater Association) take the same view about the intake air quantity. The Nagoya City works & Sewerage Bureau an some other business units set an intake air quantity for each nominal size of vertical piping base on Scaninavian countries' view. Require intake air quantity (The Nagoya City works & Sewerage Bureau) Size at the top of water supply piping Intake air quantity [L/min (stanar conition)] Intake air quantity [L/sec (stanar conition)] P = 2.9 kpa

5 Guielines for Installing At the top of vertical piping At the top of horizontal piping On loop in piping At the centrifugal pump At hot water heating system At venting boiler or chilling unit At venting convectors At venting baseboar raiation Guielines for Installing Air Vent with Vacuum Breaker The TAV-23A Air Vent with Vacuum Breaker Piping example 15 mm or more for the TAV-2 5 mm or more for the TAV-3A (spout space) opper Drain Be sure to connect guie piping. Allow a space (15 mm or more for the TAV-2, 5 mm or more for the TAV-3A) between the en of the guie piping an the ege of the top opening of the hopper. Guie piping TAV-23A Be sure to install a stop valve. Use a gate valve or ball valve, an o not use a globe valve. Stop valve To system Flow irection In anticipation of water leakage from the air inlet or outlet of the prouct, connect inuction piping to the air inlet an outlet, an guie it to the hopper (rain itch). Keep a clearance (15 mm or more for the TAV-2, 5 mm or more for the TAV-3A) between the en of the inuction piping an the overflow line of the hopper. *When hot water is use, its leakage may cause burns or contamination in the area where the prouct is installe. Before connecting the prouct, carefully wash the insie of piping to remove irt, scale, etc. When connecting the prouct to piping, pay attention to the quantity an application position of sealing agent or where to attach seal tape. Do not isassemble the prouct. Prepare enough space for inspections, maintenance, an repairs. Do not install the prouct uner the roof or insie the wall. Vertically install the prouct in a position where air tens to accumulate. Use a stop valve (gate valve, ball valve, cock, etc.) for maintenance an inspections in any case. Do not use a globe valve. Drain water when the atmospheric temperature is low, in winter for example, or water is not to be use for a long perio of time. 292

6 Ductile iron Bronze TA Wier pressure range than that of conventional air vent valves an applicable to from low pressure to high. 2. No leakage from the valve ue to synthetic rubber use for valve seat. owever, just in case, the copper pipes are connecte to the exhaust port. 3. To prevent scale problem, unique valve mechanism keeps the seat surface clean. 4. Parts are easy to replace, maintain an inspect from outsie even if the valve seat surface is amage in long perio operation. 5. Since the boy of the TA-6 is mae of bronze, this type is free from rusty water. 6. Compact boy while exhaust capacity is 1.5 times larger than that of conventional air vent valve. oel aximum temperature Boy, cover Valve aterial Valve seat TA-3 TA-6 Col an hot wateroil (specific gravity:.8 or more).11. Pa C Ductile cast iron Cast bronze (equippe with NBR isc) JIS Rc screwe The boy of the TA-3 is electroeposition-coate for rustproofing. Dimensions (mm) an s (kg) 1 C A 32A Rc 1/2 Rc 3/4 Rc 1 Rc 1-1/ C

7 Ductile iron Bronze TA-255F 1. Equippe with a quick exhaust mechanism, air insie piping can be quickly ischarge at the time of initial water supply, ensuring smooth water supply. 2. Wier pressure range than that of conventional air vent valves an applicable to from low pressure to high. 3. Parts are easy to replace, maintain an inspect from outsie even if the valve seat surface is amage in long perio operation. 4. Since the boy of the TA-5 an TA-5F is mae of bronze, these types are free from rusty water. 5. Sucks in air promptly an automatically when pressure becomes negative in piping or tank, preventing amage to piping components by negative pressure. oel aximum temperature Operating pressure range of quick exhaust valve aterial Boy Cover Valve Sub valve TA-2 TA-5 TA-5F Col an hot wateroil (specific gravity:.8 or more).11. Pa C C.1 Pa or less Ductile cast iron Cast bronze Bronze (equippe with NBR isc) JIS Rc screwe The boy of the TA-2 is electroeposition-coate for rustproofing. (equippe with FK isc) Dimensions (mm) an s (kg) A 32A Rc 1/2 Rc 3/4 Rc 1 Rc 1-1/ C C 294

8 A i r A Vi er n Vt e Vn at l v e TA-1111L 1. Easy to clean by removing the valve seat even if scale or irt eposits on the valve isc or valve seat. 2. Can be installe in small space because of compact boy. 3. Since the shapes of valve an float aopt Yoshitake unique structure, stable performance an sufficient exhaust capacity can be obtaine. 4. Even if water leaks out of the TA-11 ue to failure, it can be stoppe immeiately by tightening the en cap, ensuring safety. 5. Vinyl hose can be connecte easily to the TA-11L. 295 aximum temperature Boy Disc aterial Seat Inlet 37 Outlet etal plating Dimensions (mm) an s (g) TA-11 6A 1A A TA-11 /8 R 3/ Capable of turning Col an hot water.1.3 Pa C NBR eat-resistant resin JIS R screwe TA-11: Cap type TA-11L: ose joint type Nickel-plate TA-11L TA-11L 6A 1A A /8 R 3/ The shapes of 6A an 1A are slightly ifferent. Exhaust Capacity Chart Exhaust capacity L/min (stanar conition) TA Operating pressure Pa

9 Bronze TA-2222L 1. Easy to clean by removing the valve seat even if scale or irt eposits on the valve isc or valve seat. 2. Can be installe in small space because of compact boy. 3. Since the shapes of valve an float aopt Yoshitake unique structure, stable performance an sufficient exhaust capacity can be obtaine. 4. Even if water leaks out of the TA-22 ue to failure, it can be stoppe immeiately by tightening the en cap, ensuring safety. 5. Vinyl hose can be connecte easily to the TA-22L. aximum temperature Boy Disc aterial Seat Inlet Outlet etal plating Col an hot water.11. Pa C Bronze FK eat-resistant resin JIS R screwe TA-22: Cap type TA-22L: ose joint type Nickel-plate TA-22 Dimensions (mm) an s (g) TA-22 A D TA-22L A D D TA Capable of turning 3 D 6 TA-22L Exhaust Capacity Chart Exhaust capacity L/min (stanar conition) Operating pressure Pa 296

10 TA-1616L 1. All parts, except for the valve isc, gasket, L-shape hose joint (TA-16L), are mae of stainless steel, offering high resistance to corrosion an urability. 2. Wie working pressure range (.1 to 1. Pa) ensures stable exhaust capacity. 3. Can be installe in small space because of compact boy. 4. Outstaning sealability offere by fluororubber valve isc. 5. The TA-16 can be connecte to any exhaust piping easily by attaching optional piping connection parts. oel aximum temperature Boy, cover Valve isc aterial Gasket Inlet Outlet Dimensions (mm) an s (g) TA-16 A TA-16 TA-16L Col an hot water.11. Pa C FK FK JIS R screwe JIS Rc screwe ose joint type (ose bore) TA-16L A Exhaust Capacity Chart TA TA-16 TA-16L 1 Exhaust capacity L/min (stanar conition) Operating pressure Pa Option Available with manual valves, swivel joints (capable of turning 3 egrees), etc. (mae of brass) as piping connection parts for the exhaust ports of air vent valves. 297 L-shape hose joint (/4 x6) anual valve with copper joint (/4 x8) For other connection parts, please contact us. anual valve with hose joint (/4 x6) Swivel joint (/4 xrc 1/4) Swivel copper pipe joint (/4 x8) Swivel hose joint (/4 x6)

11 TA-16CVA16CVS 1. All parts, except for the valve isc, gasket, check valve, check valve joint, are mae of stainless steel, offering high resistance to corrosion an urability. 2. Wie working pressure range (.1 to 1. Pa) ensures stable exhaust capacity. 3. Can be installe in small space because of compact boy. 4. Outstaning sealability offere by fluororubber valve isc. 5. The TA-16CVS can be connecte to any exhaust piping easily by attaching optional piping connection parts. 6. Provie with check valves, the prouct o not suck in air even if the inlet pressure is negative. oel Closing pressure of check valve aximum temperature Boy, cover Valve isc Gasket aterial Check valve joint Check valve Inlet Outlet Dimensions (mm) an s (g) TA-16CVA A TA-16CVA TA-16CVS Col an hot water.11. Pa.5 Pa C FK FK FK JIS R screwe JIS Rc screwe TA-16CVS A Exhaust Capacity Chart TA-16CVA TA-16CVS TA-16CVA TA-16CVS Operating pressure Pa Option Available with manual valves, swivel joints (capable of turning 3 egrees), etc. (mae of brass) as piping connection parts for the exhaust ports of air vent valves. Exhaust capacity L/min (stanar conition) L-shape hose joint (/4 x6) anual valve with copper joint (/4 x8) For other connection parts, please contact us. anual valve with hose joint (/4 x6) Swivel joint (/4 xrc 1/4) Swivel copper pipe joint (/4 x8) Swivel hose joint (/4 x6) 298