TECHCON SYSTEMS TS941 User manual

Techcon Systems
TS941/TS934
TS941A/TS934A
Spool Valve
User Guide

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CONTENTS
Pagenumber
1. Specifications ………………………………………………………………………………3
2. Unpacking and Inspection ………………………………………………………………4
3. Description ………………………………………………………………………………4
4. Theory of Operation ………………………………………………………………………4
5. Setup Instructions ………………………………………………………………………5
6. Typical System Setup ………………………………………………………………………6
7. Troubleshooting ………………………………………………………………………7
8. Maintenance and Cleaning ………………………………………………………………8
9. Spare Parts and Accessories ………………………………………………………………10
10. Warranty ………………………………………………………………………………11

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1. SPECIFICATIONS
TS941/TS934 TS941A/TS934A
Size 4.7” length X 1.5” diameter
(119.4mm X 38.1 mm)
4.7” length X 1.5” diameter
(119.4mm X 38.1 mm)
Weight TS941 = 1.6lb (0.728kg)
TS934 = 1.15lb (0.522kg)
TS941A = 1.61lb (0.731kg)
TS934A = 1.16lb (0.526kg)
Fluid Inlet Port 3/8”NPT female 1/4”NPT female
Fluid Outlet Port 1/4" NPT female 1/4" NPT female
Air Inlet Port 1/4" NPT female 1/4" NPT female
Auxiliary Air Inlet Port 1/8” NPT 1/8” NPT
Minimum Air Pressure
Required
70 psi (4.8 bars) 70 psi (4.8 bars)
Maximum Fluid Pressure 2,500 psi (172 bars) 2,500 psi (172 bars)
Operating Frequency Exceed 400 cycles/min. Exceed 400 cycles/min.
Wetted Parts
Fluid housing = Stainless steel
(TS941); Aluminum (TS934)
Valve spool= Hard Chrome plated
Stainless Steel
Upper and Lower Seals =UHMWPE
Seal with EPR O-ring
Fluid housing = Stainless steel
(TS941); Aluminum (TS934A)
Valve spool=Hard Chrome plated
Stainless Steel
Upper and Lower Seals =UHMWPE
Seal with EPR O-ring
Figure 1.0

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2. UNPACKING AND INSPECTION
Carefully unpack the valve and examine the items contained in the carton.
These will include:
•Valve Assembly
•User Guide
•Fitting and Valve Air Hose
Inspect the unit for any damaged which may have occurred in transit. If such damage has occurred,
notify the carrier at once. Claim for damage must be made by the consignee to the carrier, and should be
reported to the manufacturer.
3. DESCRIPTION
The TS941 spool valve is based on a balanced spool design for a fast “ON/OFF” dispensing action. The
hardened spool slides in reinforced UHMWPE seals and it suitable for use with fluids having viscosity
of 100 to over 3,000,000 cps at pressure up to 2,500 psi (172 bars). An internal spring return makes the
valve fully adaptable for use with Techcon Systems time/pressure controllers.
4. THEORY OF OPERATION
The TS941 valve is a normally closed spool valve. When air pressure is applied at air inlet port (1), the
spool assembly (2) moves forward to the open position, allowing the fluid to flow from the fluid inlet
port (3) to the fluid outlet port (4). Relieving the input air pressure allows the return spring (5) to pull
the spool assembly back in the close position, stopping the fluid flow. During the closing position, the
spool movement creates a “suck-back” anti-drip feature.
An Oil chamber (6) is provided above the upper seal to create an additional liquid seal that will prevent
moisture from being carried on the spool. The auxiliary air inlet port (7) is provided so that the valve
may be connected for air closing with or without the spring.
1
Open Position
Closed Position
Figure 2.0

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5. SETUP INSTRUCTIONS
•Connect the fluid reservoir feed tube (1) to the valve inlet port (2).
•Connect the valve airline (3) to the valve controller or other pneumatic device that is used to
control the valve.
•Connect appropriate nozzle or dispensing tip (4) to the fluid outlet port.
•Set the valve controller pressure at 70 psi (4.8 bars)
•Set the fluid reservoir pressure. Do not exceed 2,500 psi (172 bars)
•Make sure all connections are tight
•Place container under the valve outlet and activate the valve until the fluid flows steady.
The amount of fluid that flows through the valve is determined by:
•Valve open time
•Fluid reservoir pressure
•Dispensing tip size
NOTE: Techcon makes an available an adjustable “suck-back” cap part number 934-003-000
Figure 3.0

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TECHCON SYSTEMS TS5130
CONTROLLER OR EQUIVALENT FLUID FEED SYSTEM
PLANT AIR MUST BE PROPERLY
FILTERED AND DRY. IF NOT, SPECIFY
A 5-MICRON FILTER REGULATOR.
MATERIAL
CONSTANT AIR
PULSED AIR
TS941
SPOOL VALVE
6. TYPICAL SYSTEM SETUP
Figure 4.0

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7. TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE CORRECTION
Fluid pressure too low Increase fluid pressure
Operating pressure too low Increase air pressure to 70 psi (4.8 bars)
Dispense tip clogged or damaged Replace tip
No fluid flow
Fluid cured in valve chamber Clean valve thoroughly
Fluid pressure fluctuating Make sure fluid pressure is constant
Valve operating pressure is too
low Increased valve pressure to 70 psi (4.8 bars)
Valve open time is not consistent Check to make sure the valve controller
is providing a consistent output
Inconsistent
fluid flow
Air trapped in fluid housing Purge valve
Fluid drools after the valve
closes, eventually stopping Air trapped in fluid housing Purge valve
Lower seal damaged or worn Replace lower seal
Spool damaged Replace spool
Inlet air fitting is too long,
pushing the spool opened Replace air fitting
Steady drip
Valve re-assembled incorrectly Re-assemble valve follow instructions

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8. MAINTENANCE AND CLEANING:
Normally, purging the valve with appropriate flush material or solvent after use is sufficient for
cleaning. However some material may cause a buildup in the valve chamber, in this case periodic and
thorough cleaning will be required.
CAUTION: Make sure the fluid pressure is released before disassemble the valve.
1) Release fluid pressure
2) Disconnect fluid line
3) Disconnect valve air line
4) Remove end cap (1)
5) Pull out Piston/valve spool assembly (4)
6) Remove the spring from air cylinder (2)
7) Remove socket head cap screws (10)
8) Separate material outlet block (9), material inlet block (6) and air cylinder (3). Clean
these parts if necessary
9) Replace o-rings (13) on the spool shaft, material outlet block (8) and air cylinder (12) if
worn or damaged.
10)Remove lower seals (7) out of the outlet block and upper seal (5) out of the air cylinder
using a small screw driver
11)Clean seal seats and carefully install new seals. It is important that seals should be
replaced in the same orientation to prevent leaks and accelerated wear.
12)Lubricate O-rings with “Parker-o-lube” or similar grease
13)Assemble Material outlet block, Material inlet block and Air cylinder.
14)Thread Socket head cap screws into assembled valve. Tighten uniformly to ensure
proper valve alignment.
15)Insert the spring back into the air cylinder.
16)Insert Piston/valve spool into valve body.
17)Install air fitting to end cap.
18)Install End cap to air cylinder. (HAND TIGHTEN ONLY)
Figure 5.0

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9. SPARE PARTS AND ACCESSORIES
9.1 Spare Parts
PART NUMBER DESCRIPTION
941-SEALKIT Seal repair kit (include O-rings, upper and lower seal)
941-VALVEKIT Valve repair kit (include seal repair kit plus valve spool)
9.2 Alternative Seals
Techcon Systems offers other custom seal materials for different applications.
The standard seals installed in the valve are made of UHMWPE with EPR o-ring.
The following seals are available:
PART NUMBER DESCRIPTION
TSD400-56 Teflon®seal with EPR expander O-ring
TSD400-58 Teflon®seal with Viton expander O-ring
TSD400-49 Teflon®seal with stainless steel expander spring
9.3 Standard Accessories
PART NUMBER DESCRIPTION
TSD700-1 Oiler cup, 90 degrees
TSD931-15 1/4 “NPT X Female luer lock fitting
TSD918-3 1/4” NPT Male X 1/4” NPT Female Elbow fitting
TSD918-7 Needle adapter
TSD700-1 Oiler cup
TSD912-15 3/8” NPT X1/4” NPT reducer

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9.4 Optional Accessories
T1000268 Bracket
Figure 6.0
Dispensing Nozzles
PART NUMBER DESCRIPTION
TSD700-2 Oiler cup, straight
918-006-000 Tip adapter, Metal (Brass and Stainless steel)
T1000268 Bracket
934-003-000 Adjustable suck back cap

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10. LIMITED WARRANTY
Manufacturer warrants this product to the original purchaser for a period of one (1) year from date of
purchase to be free from defects in material and workmanship, but not against damages by misuse,
negligence, accident, faulty installations and instructions. Manufacturer will repair or replace (at
factory’s option), free of charge, any component of the equipment thus found to be defective, on return
of the component, “PREPAID” to the factory during the warranty period. In no event shall any liability
or obligation of the Manufacturer arising from this warranty exceed the purchase price of the equipment.
This warranty is only valid if the defective product is returned as a complete assembly without physical
damage. The Manufacturer’s liability, as stated herein, cannot be altered or enlarged except by a written
statement signed by an officer of the company. In no event shall the Manufacturer be liable for
consequential or incidental damages. A return authorization is required from Techcon Systems prior to
shipping a defective unit to the factory.
Manufacturer reserves the right to make engineering product modifications without notice.
Send warranty returns to:
OK International
Garden Grove Division
12151 Monarch Street
Garden Grove, Ca 92841
Teflon is a registered trademark of E.I. DuPont.
TSI-0130-D

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