Emerson ACE95Jr Data Sheet

Bulletin 74.1:ACE95JR

Type ACE95jr Tank Blanketing Valve

Features

• Stainless Steel

• Fully Balanced Plug Design Reduces Inlet Pressure Sensitivity

Construction Available

April 2012

• High Sensitivity

• Bubble Tight

Shutoff

W8157

Figure 1. Type ACE95jr Tank Blanketing Valve

Introduction

Tank blanketing is the process of using a gas, usually an inert gas such as nitrogen, to maintain a slightly positive pressure in an enclosed storage tank. Tank blanketing prevents a stored product from vaporizing into the atmosphere, reduces product combustibility, and prevents oxidation or contamination of the product by reducing its exposure to air. Tank blanketing is utilized with various products, including: adhesives, pharmaceuticals, pesticides, fertilizers, fuels, inks, photographic chemicals, and food additives.

• Self-Contained

• Vacuum Settings Available

Type ACE95jr valves are self-contained, fully balanced, and used for accurate pressure control on tank blanketing systems. These valves help control emissions and provide protection against atmospheric contamination. Type ACE95jr valves maintain a positive tank pressure which reduces the possibility of tank wall collapse during pump out operations and prevents a stored product from vaporizing to atmosphere.

www.sherregulators.com

D102722X012

Bulletin 74.1:ACE95JR

Specications

Sizes and End Connection Styles 1/2 NPT

1 x 1/2 NPT 1 NPT NPS 1/2 / DN 15, CL150 RF NPS 1 / DN 25, CL150 RF NPS 1 x 1/2 / DN 25 x 15, CL150 RF NPS 1 / DN 25, Sanitary Flange

Maximum Operating Inlet Pressure

(1)

200 psig / 13.8 bar

Maximum Emergency Outlet (Casing) Pressure

20 psig / 1.4 bar

Maximum Operating Control Pressure

(1)

1.5 psig / 0.10 bar

Control Pressure Ranges

(1)

See Table 1

Maximum Differential Pressures

Up to 200 psig / 13.8 bar

Main Valve Flow Characteristic

Linear

Pressure Registration

External

Capacities

See Table 4

Temperature Capabilities

Nitrile (NBR):

(1)

-20 to 180°F / -29 to 82°C

Fluorocarbon (FKM): 0 to 212°F / -18 to 100°C Ethylenepropylene (EPDM - FDA):

-20 to 212°F / -29 to 100°C Peruoroelastomer (FFKM):

-20 to 212°F / -29 to 100°C

Flow Coefcients for Relief Valve Sizing

(1)

(110% of rated Cv) Cv 0.2 use Cv 0.22 Cv 0.4 use Cv 0.44

IEC Sizing Coefcients XT: 0.655; FD: 0.86; FL: 0.89

Construction Materials

Body: 316 Stainless Steel Trim: 304 Stainless Steel and 316 Stainless Steel Elastomers: Nitrile (NBR), Fluorocarbon (FKM), FDA-Ethylenepropylene (EPDM), or

Peruoroelastomer (FFKM)

Diaphragm: Polytetrauoroethylene (PTFE) Actuator: 316 Stainless Steel or Carbon Steel

Approximate Weight (with all accessories)

30 pounds / 14 kg

1. The pressure/temperature limits in this Bulletin, and any applicable standard or code limitation should not be exceeded.

Table 1. Control Pressure Ranges

OUTLET (CONTROL PRESSURE RANGE)

inches w.c. mbar inches mm inches mm

-5 to -0.5 -12 to -1 GC220701X22 Stainless Steel

-1 to 1 -2 to 2 GC220701X22 Stainless Steel

0.5 to 5 4 to 10 8 to 15

0.5 to 1.5 psig

1. The second spring is located under the diaphragm assembly.

1 to 12 10 to 25 20 to 37

34 to 103

Features and Benets

Large PTFE Diaphragm—Resistant to corrosion and

highly sensitive to changes in tank pressure.

Fully Balanced—Eliminates setpoint changes caused by variations in inlet pressure.

Large Actuator—Large actuator diaphragm increases sensitivity to tank pressure changes.

Rolling Diaphragm—The rolling diaphragm balances the pilot valve and eliminates friction, resulting in extremely accurate control.

SPRING PART NUMBER SPRING MATERIAL

GC220701X22 GC220702X22 GC220703X22 GC220708X22

Stainless Steel Stainless Steel Stainless Steel Stainless Steel

Options and Accessories

Inlet Pressure Gauge—Displays pressure of blanketing

gas supply to the tank blanketing valve. Control Pressure Gauge—Low-pressure gauge to

measure control pressure (tank pressure). Purge Meter (Rotameter)—Maintains a small amount of

ow through the sensing or main line. Prevents corrosive

tank vapors from damaging upstream equipment. Pressure Switch—Allows installation of an alarm system

to indicate low or high-pressure on the tank.

SPRING

FREE LENGTH

2.75

0.88

2.75

1.60

2.75

2.00

2.75

69.8

22.4

69.8

40.6

69.8

50.8

69.8

(1)

SPRING WIRE

0.080

0.085

0.080

0.065

0.080

0.112

0.125

0.225

DIAMETER

2.03

2.16

2.03

1.65

2.03

2.84

3.17

5.71

(1)

Bulletin 74.1:ACE95JR

POPPET

CAGE

O-RING SEAT

ROLLING DIAPHRAGM

VALVE CLOSED

SENSING CONECTION

INLET

VALVE OPEN

E0205

INLET PRESSURE

ATMOSPHERIC PRESSURE

TANK PRESSURE

Figure 2. Operational Schematic

Outlet Check Valve—Prevents corrosive gases and

vapors from owing back into the blanketing system

through the delivery line. Single Array Manifold (SAM)—Provides sense line

connection and main valve connection through a single tank nozzle.

Inlet Filter—Screens out any foreign material upstream

that may cause blockage in the gas ow.

Principle of Operation

The Type ACE95jr tank blanketing valve controls the vapor space pressure over a stored liquid. When liquid is pumped out of the tank or vapors in the tank condense, the pressure in the tank decreases. Tank pressure is sensed by the large actuator diaphragm. When tank pressure is less than the valve set pressure, spring force moves the actuator diaphragm downward.

TO TANK

When the actuator moves downward, it pushes open the

valve plug which allows ow in to the tank. See Figure 2.

When pressure in the tank increases above setpoint, the large actuator diaphragm is pushed upward, allowing the valve plug to close.

The valve plug is balanced (inlet pressure creates equal upward and downward force on these components); therefore, the outlet (control) pressure of the unit is not

affected by uctuating inlet pressure.

Installation

The Type ACE95jr tank blanketing valve was assembled

and preset to the customer specied pressure and

setpoint at the factory. The outlet (control) pressure range of the valve is stamped on the nameplate fastened to the upper actuator case. The gas blanketing setpoint is the only adjustable feature on this unit.

+ 5 hidden pages