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Bulletin 74.1:Y693

December 2014

D102026X012

www.fisherregulators.com

Type Y693 Gas Blanketing Regulator

Introduction

An Accu-Pressure™ Gas Blanketing Regulator

reduces a high pressure gas, such as nitrogen, to

maintain a protective environment above any liquid

stored in a vessel or tank when the liquid is being

pumped out. Also when the vessel is suddenly cooled,

causing vapors inside the vessel to contract, the

regulator system replaces the volume of contracting

vapors with a volume of blanketing gas to prevent

the internal vessel pressure from decreasing. In both

cases a slight positive vessel pressure prevents

outside air, moisture and other contaminants from

entering the vessel and the possible collapse of the

vessel walls.

The Type Y693 (Figure 1) is a direct-operated

regulator used for accurate pressure control on low

pressure blanketing systems. Downstream pressure

is sensed through an external control line in the lower

casing of the regulator. The Type Y693 is available in

NPS 1-1/2 and 2 / DN 40 and 50 body sizes.

Features

• Ease of Inspection and Maintenance—The union

nut and/or hex head bolt connection between the

body and actuator permits access to the disk and

oricebyonlyremovingthediaphragmcasing

assembly without removing the body from the

pipeline (see Figure 2).

• Accuracy of Control—Balanced trim and large

diaphragm area reduces hysteresis to as little

as +/- 0.50 in. w.c. / 1 mbar deviation from setpoint.

• Inlet Pressure Sensitivity—Less than

0.25 in. w.c. / 0.6 mbar setpoint shift over the

entire inlet pressure range.

• Speed of Response—A change in vessel pressure

registers directly under the diaphragm resulting in

the fastest possible speed of response.

• Variety of Materials—Regulator body, trim

and valve disk are available in various material

combinationsforprocessuidcompatibility.

• Outlet Pressure Stability—4 to 1 lever ratio reduces

regulatorsensitivitytoinletpressureuctuation.

• Tight Shutoff Capability—Aat-faceddisk

of Nitrile (NBR), Fluorocarbon (FKM) or

Polytetrauoroethylene(PTFE)providesexcellent

shutoff capability.

Figure 1. Type Y693 Gas Blanketing Regulator

W6200

1 2 3 4 5 6 ... 11 12

Bulletin 74.1:Y693 1

Inhaltsverzeichnis

Seite 1 - Bulletin 74.1:Y693

Bulletin 74.1:Y693December 2014D102026X012www.fisherregulators.comType Y693 Gas Blanketing RegulatorIntroductionAn Accu-Pressure™ Gas Blanketing Regul

Seite 2

Bulletin 74.1:Y69310SPRING RANGE,PART NUMBERAND COLORCONTROL PRESSURE SETTINGINLET PRESSURECAPACITIES IN SCFH / Nm3/h OF 0.97 SPECIFIC GRAVITY NITROGE

Seite 3

Bulletin 74.1:Y69311IN. /mm14B0813-AALUMINUM LOWER CASING VERSION WITH A STEEL BODY14B0812-ASTEEL OR STAINLESS STEEL LOWER CASING VERSION3/4 NPTVENTCO

Seite 4

Seite 5

Bulletin 74.1:Y69321.EndconnectionsforotherthanU.S.standardscanusuallybeprovided;consultyourlocalSalesofce.2.Fabricatedbyusingsli

Seite 6

Bulletin 74.1:Y6933Figure 2. Type Y693 Regulator Construction FeaturesALUMINUM LOWER CASING VERSIONSTEEL OR STAINLESS STEEL LOWER CASING VERSIONW6240-

Seite 7

Bulletin 74.1:Y6934Principle of OperationThe Type Y693 Gas Blanketing Regulator reduces a higher-pressure gas to maintain a positive low pressure of b

Seite 8

Bulletin 74.1:Y6935Table 2. Type Y693 Regulator Construction MaterialsPART NAMEMATERIALAluminum Lower Casing Version Steel or Stainless Steel Lower Ca

Seite 9

Bulletin 74.1:Y6936Table 3. Materials CompatibilityCORROSION INFORMATIONFluidMaterialFluidMaterialCarbon SteelCast Iron316 Stainless SteelCarbon Steel

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Bulletin 74.1:Y6937Table 4. Flow Rate Conversion (Gas flow required to replace or displace Blanketing Gas with Pump-Out or Pump-In of Liquid)MULTIPLY

Seite 11

Bulletin 74.1:Y6938Table 6. Typical Type Y693 Blanketing Regulator Capacities in SCFH / Nm3/h of 0.97 Specific Gravity Nitrogen-continued-SPRING RANGE

Seite 12

Bulletin 74.1:Y6939Table 6. Typical Type Y693 Blanketing Regulator Capacities in SCFH / Nm3/h of 0.97 Specific Gravity Nitrogen (continued)-continued-