Milton Roy MROY User manual

mROY®

Pneumatic Capacity Control

Instruction Manual

Manual No. : 53871

Rev. : 01 Rev.

Date : 05/2019

3Instruction Manual

PRECAUTIONS

For Pumps with PVC & 316SS Liquid Ends

WHEN USED IN SWIMMING POOLS OR SPAS/HOT TUBS (ANSI/NSF 50)

Caution on Chemical Concentration:

There is a potential for elevated chemical concentration during periods of no ow, for

example, during backwash in the system. Steps, such as turning the pump off, should be

taken during operation or installation to prevent this. Contact your sales representative or

distributor about other external control options to help mitigate this risk.

Flow Indicating Device:

To ensure operation of the pump it is recommended that some type of ow indicating device

be installed to measure water ow rates and be appropriate for the output of the pump.

Contact your distributor or sales representative for further information.

Head Loss / Over Pressure Protection / Back Pressure-Anti-Siphon Valve:

• Milton Roy metering pumps are positive displacement. Head loss is not applicable to the

pump.

• To ensure safe operation of the pump it is recommended that some type of safety/pressure

relief valve be installed to protect the piping and other system components from failing due

to excessive pressure.

• If you are pumping downhill or into low or no system pressure, a back pressure/anti-siphon

device should be installed to prevent over pumping or siphoning. Contact your distributor or

sales representative for further information.

Additional Operation and Installation Instructions for 316SS or PVC Liquid Ends:

• Application of this pump to swimming pool/spas only evaluated to NSF/ANSI 50.

• There is a potential for elevated chemical concentration during periods of no ow, for

example, during backwash in the system. Steps, such as turning the pump off, should be

taken during operation or installation to prevent this. See your sales representative or

distributor about other external control options to help mitigate this risk.

• Liquid Compatibility CAUTION: Determine if the materials of construction included in the

liquid handling portion of your pump are adequate for the solution (chemical) to be pumped.

ALWAYS wear protective clothing, face shield, safety glasses and gloves when working on

or near your metering pump. Additional precautions should be taken depending on the

solution being pumped. Refer to MSDS precautions from your solution supplier. Reference a

Milton Roy Material Selection Chart for aid in selecting appropriate material of construction

for uids of your specic metering pump. Contact your sales representative or distributor for

further information.

4Instruction Manual

SECTION 1 - PNEUMATIC CAPACITY CONTROL ................................................ 5

SECTION 2 - DISASSEMBLY AND ASSEMBLY PROCEDURE ...................................... 7

2.1 DISASSEMBLY .................................................................. 7

2.2 ASSEMBLY ..................................................................... 7

2.3 CALIBRATION AFTER ASSEMBLY................................................... 7

SECTION 3 - GENERAL PERFORMANCE...................................................... 8

SECTION 4 - OPERATING SPECIFICATION .................................................... 9

SECTION 5 - TABLE OF EQUIVALENTS ...................................................... 11

LIST OF ILLUSTRATIONS

FIGURE 1. Assembly Pneumatic Capacity Control................................................ 10

TABLE OF CONTENTS

5Instruction Manual

Reference the drawing for pneumatic capacity

control assembly and operating principles

(pages 3 and 4) for a schematic and cross section

representation of the pneumatic capacity control

positioner mounted on the mRoy pump. The

assembly consists of three major sections as

follows:

1. The Moore Products Company, Model 73N air

control valve which continuously compares the

location of the piston in the pneumatic cylinder

with the instrument air pressure and regulates

the supply air pressure imposed on one side

of the piston to obtain the required piston

position.

2. The pneumatic cylinder, with a differential area

piston, is the device that moves the capacity

control spool of the pump in response to the

metered supply pressure from the air control

valve. The cylinder is made of a clear impact

resistant plastic, so that the position of the

piston is visible at all times for comparison

against a “Percent Capacity” decal. (Read

percent capacity at the black line of the O-ring

contact).

3. The mounting ange, which is used to rigidly

mount the assembly onto the standard

production mRoy pump assembly, forms the

end of the pneumatic cylinder and seals off the

I.D. of the piston to establish a differential area

between the two sides of the piston.

At time of installation, the instrument air pressure

(Pi) and the supply air pressure (Ps) are connected

to the corresponding ttings in the air control valve.

The supply air (Ps) is routed internally to the pilot

valve and it is also routed unrestricted, internally

through the cylinder wall onto the small area (pump

side) of the differential area piston. The instrument

air pressure (Pi) is routed to a “dead end” cavity

formed by the exible diaphragm assembly.

As shown by the schematic, the supply pressure

imposed on the small area side of the piston

creates a force to move the piston until it bears

against, and compresses, the range spring. The

range spring in turn is supported by the exible

diaphragm assembly which bears against the stiff

suppression spring. The diaphragm assembly is

then a moveable element between two opposing

spring forces. This movement of the diaphragm

assembly is transmitted to the pilot valve which

acts to either increase or decrease the metered

supply air pressure (Psm) imposed on the large

area side of the piston. The relationship of metered

supply pressure (Psm) on one side and full supply

pressure (Ps) on the other side of the differentially

area piston is used to establish and maintain the

required capacity control position. A xed air bleed

is incorporated in the metered supply ‘pressure

chamber which will maintain a small air ow across

the pilot valve to provide instant response to any

changes in the operating conditions.

SECTION 1 - PNEUMATIC CAPACITY CONTROL

6Instruction Manual

SECTION 1 - PNEUMATIC CAPACITY CONTROL

In operation, an increase in instrument air pressure

(Pi) upsets the balanced forces and moves the

diaphragm assembly to the left. This lifts the pilot

valve above its seat to reduce the air pressure drop

across the pilot valve and increases the metered

supply pressure, (Psm) on the downstream side

of the pilot valve, which is imposed on the large

side of the air piston. The metered supply pressure

will continue to increase until sufcient force is

developed to move the piston to the right which

increases the pump capacity.

As the piston moves, the range spring feeds back

a force proportional to the piston location so that

when the range spring pressure plus the diaphragm

force from the instrument air signal are again in

balance with the suppression spring force, the pilot

valve closes and maintains a balanced pressure

condition.

A decrease in instrument air pressure moves the

diaphragm assembly to the right which seats the

head of the pilot valve and lifts the pilot valve stem

off the exhaust seat. This vents the pressure (Psm)

on the large side of the piston at atmosphere (Pa),

then the supply pressure on the small side of the

piston will move the piston to the left to decrease

the pump capacity. Again the range spring feeds

back to the positioner the location of the air piston

until the forces are again in the balanced condition.

7Instruction Manual

SECTION 2 - DISASSEMBLY AND ASSEMBLY PROCEDURE

2.1 DISASSEMBLY

1. Disconnect the supply and instrument air

pressure lines.

2. Remove the six ¼ -20 NC nuts from the air

control valve hold-down studs.

3. Mark the alignment between the air control

valve, gasket, cylinder and mounting ange to

facilitate reassembly.

4. Remove positioner by sliding off hold-down

studs.

5. Remove spring adapter plate and spring from

bore of cylinder.

6. Slide plastic cylinder off mounting studs to

expose piston.

7. Hold piston O.D. and remove mounting screw

in center of piston.

8. Remove the mounting screw in the ange and

the screw in the barrel of the ange. Now slide

the ange off the pump capacity control boss.

9. Use a thin screwdriver or similar tool to remove

“E” ring which retains the piston adapter onto

the pump capacity control spool.

This completes the disassembly.

2.2 ASSEMBLY

For assembly follow the disassembly procedure in

reverse order (descending step numbers from

9 to 1) making certain that the O-rings are lubricated

with pump oil or ring lubricant before assembly of

the retaining part. Make certain that parts are

aligned in the same way as the original assembly.

Make certain the gasket between the Moore

positioner and the cylinder body is positioned so

that the small hole in the gasket, adjacent to the

stud hole, is aligned with the corresponding hole

through the plastic cylinder.

2.3 CALIBRATION AFTER ASSEMBLY

To calibrate the pneumatic capacity control

after reassembly, apply an instrument air signal

corresponding to 100% capacity setting. Remove

the cover on the top of the valve positioner and use

a screwdriver to turn the zero adjust until the piston

seal line corresponds to the 100% graduation on

the % capacity decal. Turn the adjusting screw

counter clockwise to move the piston away from

the pump.

8Instruction Manual

SECTION 3 - GENERAL PERFORMANCE

The pneumatic capacity control assembly will

provide accurate incremental adjustment in both

directions as a linear function of the applied

instrument air pressure. There is no tendency for

the capacity control to “drift” off setting over long

periods of time because

1. There is no signicant force acting on the pump

capacity control adjustment spool.

2. The friction from, the sealing rings act to hold

the spool in position until the pneumatic capacity

control applies sufcient force to overcome this

friction.

With 40 psi supply air pressure, the pneumatic

capacity control cylinder will develop up to 40

pounds force in the direction to increase the

capacity setting and up to 110 pounds force

in the opposite direction. Then with 100 psi air

pressure applied, these forces are increased to

100 pounds and 275 pounds respectively. There is

no noticeable change in control position when the

supply air pressure is varied within the specied

pressure range. However, the nominal force

required to overcome the seal ring friction on the

control spool is in the range of 17-30 pounds, so

the pneumatic capacity control should have no

difculty providing rapid, accurate adjustment of

the pump capacity when the minimum specied

control air pressure is applied.

It should be noted that the instrument air pressure

is applied to a closed chamber in the positioner

valve so that the regulator or instrument system

establishing the air signal must incorporate a

venting air bleed to insure accurate air signal

response.

9Instruction Manual

SECTION4-OPERATINGSPECIFICATIONS

Supply Pressure Regulated 40-100 psi.

CDA (Instrument) Pressure Range 3-15 psi standard, other pressure ranges available on

special order.

Pump Capacity Variation over Instrument

Pressure Range 0-100% rated capacity.

Minimum Pressure Change Required to Reset

Capacity 0.20 psi or 0.13% of full range pressure.

Linearity of Actuator Movement

Within 5% of maximum capacity (maximum difference

in output between calibration curve and most favorable

straight line drawn through curve).

Repeatable Accuracy of Actuator Position

Within 1% of full stroke. (Maximum difference between

two positions of output for the same value of input

always approached from one direction)

Supply Air Consumption (Balanced Condition) 0.2 - 0.4 SCFM

Instrument Air Consumption 0 SCFM

Failure to Supply Pressure (Ps) Moves to 100% position.

Failure of Instrument Air (PI) Moves to 0% position.

10 Instruction Manual

1010

1000

220

980

1070

1100

1020

1050 1090

1040

990

215

1060 1080

1130

1110

1120

1140

1030

150

1145

- (ACTUATOR)

ITEM NO. DESCRIPTION

0MROY PCC INSTRUCTION MANUAL

220CLIP 1/4 E-RING EXTERNAL

150PLUG 1 NPT LVLSL HEXS 18-8SS

150PLUG 1/2 NPT LVLSL HEXS 18-8SS

215ADAPTER

980MOUNT FLANGE MROY A PNEU.

990O-RING .921 X .139 BUNA N

1000INT TOOTH LOCK WASHER #6 Z PL

1010RD HD SCR #6-32NCX7/16 Z PLT

10205/16-18 SLOTTED SHOULDER SCREW

1030O-RING#2-011 70 DURO URETHANE

1040PISTON

1050O-RING 2-226 BUNA N

1060FIL HD SCR 1/4-20X1/2 ZPL

1070GASKET, PNEUMATIC CYLINDER

1080PNEUMATIC CYLINDER POLYCARBONA

1090SPRING, ACT SH -P/N 6240-23

1100GASKET PNEUMATIC POSITIONER

1110STUD

1120MOORE POSTIONER MODEL 73N12F

1140PNEUMATIC % CAPACITY DECAL RA

11301/4-20 HEX NUT SS

Figure 1. Assembly Pneumatic Capacity Control (102197100015)

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