SPRAYER SETUP FOR TOBACCO FUMIGATION

SPRAYER SETUP FOR SPECIALISED APPLICATIONS IN TOBACCO

Here's an example of a complete layout for tobacco land fumigation prior to planting. The fumigants such as EDB - 1,2 dibromoethane or Telone^® - 1,3 dichloropropene are used with this system.   These products are particularly aggressive so the materials in contact with these spray accessories have to be carefully selected. Telone is applied as the concentrate and cannot be diluted with water. If using an old fumigant product like metham sodium, the brass regulator cannot be used.

The fumigant is fed into the pipes behind the tines on the implement and incorporated into the soil. It is not sprayed into the soil under pressure. An orifice plate is placed into each line to accurately meter the amount needed.

Take note of all the adaptors and hose-shanks required. We provide the entire system ready to use including the tubing.

The real world. A bit different to the promo pamphlets!

We are way beyond the accessories supply business - we're in the information business.

Telone is a registered tradename of the Dow AgroSciences organisation.

CONTACT:

chemicon@multispray.com

Tel Intl: +27 83 289 0327

Tel Natl:  083 289 0327 

THE 6815 PRESSURE REGULATING / RELIEF VALVE - What's inside and how it works.

THE 6815 PRESSURE REGULATING / RELIEF VALVE - What's inside and how it works.

Here's a simple sprayer layout using a positive displacement pump. Unlike a centrifugal pump the positive displacement pump draws in a specific volume on its suction or supply side with each revolution and pushes out that volume to the pressure or demand side. Any excess has to go somewhere or else the pump or a pipe will pack up. That's why the PRV - Pressure Relief Valve is in-line to return this excess to the tank via the bypass line.

THE PUMP PUTS OUT A SPECIFIC VOLUME WITH EACH REVOLUTION AND IT'S THE NOZZLE-TIP THAT SETS THE PRESSURE. IT SHOULD BE CLEAR THAT IF THE NOZZLE-TIPS TOTAL VOLUME EXCEEDS THE PUMP'S CAPACITY, THE PRESSURE WILL BE ZERO.

Here's a image showing the innards of the PRV. To the right a spring set, plunger and inlet for the 300 psi or 20 bar unit. The brass inlet illustrated is a 3/4" unit. The seal at the top merely prevents the spray-mix from getting past the adjusting T-screw.

To the left of the image is a spring, stainless steel plunger and hardened stainless steel inlet for the 1200 psi or 80 bar PRV. Note this inlet has 1/2" thread.

As you compress the spring and put increasing tension on the plunger,  more liquid is forced through the nozzles. The excess is forced past the plunger and returned to the tank via the bypass line.

CONTACT chemicon@multispray.com

Tel Intl: +27 83 289 0327 Tel Natl: 083 289 0327

TECHNICAL REGULATORS

EST. 1979

REGULATORS

PRESSURE RELIEF AND THROTTLING VALVES

Piston Type

23120 available with 1/2” and 3/4” inlet and bypass. Also a 1/4” port for a pressure guage. Port plug also included. Pressure rating either up to 4 bar -60 psi or 10 bar - 150 psi.

NOTE:       23120 A fitted with 316 stainless steel spring and Viton o-ring for better chemical resistance.

The male thread screws into a tee-piece on the pressure side of the system. The bypass (female outlet) returns excess fluid back to the supply tank.

Pressure is adjusted by turning the top knob. The locknut holds the knob and maintains the selected pressure.

I have seen cases where the regulator is fitted in-line.  Not a good idea! The male threaded inlet as in image is fitted into the supply line and the female outlet  is fitted directly to the delivery side.  That's when you get a call telling you that,  "I can't adjust the pressure." 

You need more information!   Pressure, flow,  guages.

chemicon@multispray.com Tel Intl:  +27 83 289 0327    Tel Natl:   0832890327