Groth 1400 User Manual

Installation, Operation and Maintenance Manual for

Pilot Operated Valves

Models 1400, 1420, 1430, 1460

IOM1400.0

January 2, 2014

REV A 12393

REF. ID 98136

IOM1400.0

REV. A 12541

TABLE OF CONTENTS

DESCRIPTION PAGE

Introduction
Pilot Valve Design and Function
Safety Warnings
Shipping, Inspection and Storage
Installation
Maintenance
Disassembly
Assembly
Figures and Tables
Troubleshooting Guide
Customer’s Notes
How to Order
Product Limited Warranty

LIST OF FIGURES

1. Tank Installation - Safety
Equipment

2. Groth Nameplate

3. Valve Port Identification

4. Available Seat Configurations

5. Model 1400

6. Model 1420

7. Model 1430

8. Model 1460

LIST OF TABLES

1. 1400 Series Pilot Operated Valve
Models

2. Body Flange Gasket Dimensions

3. Recommended Min. Torque Values

4. Notes for Figure 4 Thru Figure 7

5. Part no. for Vacuum Pallet Assy.

6. Lubricants – Specifications

7. Troubleshooting Guide

8. Abbreviations

NOTE:
For a list of abbreviations used in this manual, refer to Table 8.

1
3
3
4
4
5
5
6

6
12
13
14
14

2

2

6

7

8

9
10
11

2

4

4

6

7
12

12
12

INTRODUCTION

Pressure and/or vacuum relief valves are used
on liquid storage tanks and other process
vessels or systems to prevent structural damage
due to excess internal pressure or vacuum.

Storage tanks are pressurized when liquid is
pumped in, compressing the existing vapor or
when increasing temperature causes increased
evaporation or expansion of existing vapor.
Conversely, a vacuum may be created when
pumping out or due to decreasing temperature.
To prevent damage, vapor must be allowed to
escape or enter the tank at a specified pressure
or vacuum condition. The volume rate of
venting depends upon the tank size, volatility of
the contents, the pumping rate and the
temperature. See API Standard 2000 for the
procedures to determine venting requirements.

The pilot operated relief valve has two principal
advantages over other types of relief valves:

1) It is bubble tight to set pressure.

2) It achieves the full open position at 10%
above set pressure.

These characteristics permit operating
pressures nearer to the maximum allowable
working pressure of the tank. High operating
pressures reduce evaporation and total venting
volume, thereby reducing product loss and the
cost of processing emissions. A tank may also
have provisions for emergency pressure relief
due to fire exposure and/or inert gas blanketing
of the vapor space. A typical tank installation is
shown in Figure 1 which includes a 1400 Pilot
Operated Pressure/Vacuum Relief Valve, a Gas
Blanketing Regulator (Model 3011) and a 2500
Emergency Pressure Relief Valve which
provides protection under fire or other abnormal
conditions. Groth Corporation manufactures all
of these devices.

A Pilot Operated Valve (POV) must be carefully
maintained by a qualified valve technician. It
should only be assembled under clean
conditions, preferably in a service shop
environment. Carefully read and understand
this manual before attempting to repair a 1400
series POV. Groth Corporation provides repair
services for all products manufactured by the
Groth Products Group.

.

1

FIGURE 1: TANK INSTALLATION - SAFETY EQUIPMENT









*Pressure relief is pilot operated, vacuum relief is weight loaded.

The 1400 Series Pilot Operated Valves are
designed to provide pressure and/or vacuum
relief for API 620 and 650 tanks. Several
configurations are available; these are
summarized in Table 1 below. Each type is
available with either a standard FEP film or with
an O-Ring pallet. A variety of material options
are available depending on the type of service.

TABLE 1 : 1400 SERIES MODELS

(Pilot Operated Pressure Valves)

Model P V Vacuum Operation

1400
1420
1430
1460

The 1420 and 1460 POV are designed to be
used in header systems where the vapors are
piped away to a vapor recovery unit. The 1400
and 1430 POV’s vent to atmosphere.









Weight Loaded
Weight Loaded

Not Available
Not Available

The nameplate below shows the basic
information that is listed on each relief valve:

FIGURE 2: GROTH NAMEPLATE

For more information about these valves,
please contact:

Groth Corporation

13650 N. Promenade Blvd,

Stafford, Texas 77477

281-295-6800 (phone)

281-295-6995 (fax)

2

PILOT VALVE DESIGN AND
FUNCTION

Each application must be reviewed to ensure
material compatibility of all metal and soft good
components with the service conditions. The
pallet assembly and wetted components are
available in Aluminum or 316 SS; they may be
upgraded to Alloy C276 or other alloys for
severe corrosive service. Diaphragms are all
FEP film; other soft goods can be specified as
Buna-N, FKM, or FFKM. The standard sense
tubing is 316 SS; it is available in PVDF for
severe corrosive chemicals.

The pilot valve is set at the factory to comply
with the specification on the purchase order.
The range of adjustment will depend on the
spring installed and will be stamped on the
nameplate. The pressure setting may be

SAFETY WARNINGS

This section is an overview of safety guidelines
that should be followed during the installation,
operation, and maintenance of your valve. To
understand the context of these instructions and
warnings, read and understand this complete
manual.

The purpose of a POV is to prevent excessive
pressure in a tank or process system. The valve
must be designed for the proper MAWP and flow
requirements of the system. Consult API
Standard 2000 for tank protection sizing
procedures. An improperly specified or
functioning relief valve may result in structural
damage to the tank or system.

In the event of an actuator diaphragm failure, the
valve will vent pressure to the atmosphere,
causing the pressure relief valve to fail in the
OPEN position. The valve will function like a
weight loaded valve under this condition with a
lower setting point, and will normally provide
rated flow capacity. Consult factory for any
questions related to this over-pressure condition.

POV relief pressure and blowdown are set at the
factory per purchase order specifications.

The set pressure and range of adjustability are
stamped on the pilot valve nameplate. DO NOT

attempt to readjust the set pressure beyond the
limit specified on the nameplate.

changed within the design range either while on
line or in a service shop. Observe the proper
setting and testing procedure in the appropriate
pilot valve manual.

This manual is intended to provide
recommended procedures and practices for
installation, operation, and maintenance of the
Groth Series 1400 Pilot Operated Valve (POV)
Series. Any standard procedures and practices
developed for a specific plant or process may
supersede this manual. Although this manual
cannot cover all possible contingencies,
following these guidelines should provide safe,
reliable pilot valve performance.

Note: This manual covers the operation and
maintenance of only the main valve; refer to the
appropriate manual for the pilot valve
instructions.

The pilot sense line is either 3/8" OD SS tubing,
or 1/2" NPT PVDF pipe. It must be kept open
and unobstructed to ensure that the pilot
"senses" actual tank pressure. For applications
where tank vapors may condense or
"polymerize" in the sense tube or pilot valve, a
nitrogen purge may be required to prevent
internal obstruction of the tube. Consult the
factory for recommendations.

DO NOT attempt to remove the pilot valve from
the main valve without removing or isolating the
relief valve from the system. ALTERNATIVE
MEANS OF PRESSURE RELIEF MUST BE
PROVIDED WHEN THE VALVE IS OUT OF
SERVICE. After isolating the relief valve, bleed
all pressure from both main and pilot valve
before removing the valve. Consult the pilot
valve manual before attempting to repair it. Both
the pilot valve and POV are exposed to process
vapors. Observe all plant procedures and
Material Safety Data Sheet recommendations
for the products in the system when inspecting,
adjusting or servicing the valves. Vents on the
body and spring bonnet of the pilot valve must
be clean and unobstructed for proper and safe
operation of the valve. These vents should be
inspected periodically, and cleaned or replaced,
if necessary.

3

SHIPPING, INSPECTION AND
STORAGE

The POV is packed and supported to prevent
damage or contamination during shipping. It
should be similarly protected during subsequent
handling and storage. Always keep all ports
plugged to prevent intrusion of foreign materials.
Inspect the valve for any sign of damage that
may have occurred in shipment and report this
to the carrier. If there are indications of physical
damage or internal contamination, the valve
must be disassembled, cleaned and inspected
before installation. The spring adjustment cap
and blowdown screw locknut will be "car sealed"
to ensure that the factory pressure setting has
not been altered.

Inspect the valve for any sign of damage that
may have occurred in shipment and report this
to the carrier and Groth Corporation.

Lifting eyes are provided on the upper actuator
for handling the valve. To avoid damage to the
lower flange surface, set the valve on a soft
clean gasket material until it is ready to be
installed. It should be stored in a clean
environment until it is to be mounted on the tank.

The pilot pickup fitting is in the body and must
be kept completely free of all foreign materials.
DO NOT store the valve directly on the ground.

INSTALLATION

The 1400 Series valves are precision devices
that must be handled carefully to ensure seat
tightness.

1. At installation, the valve should be smoothly
lifted into position using the lifting eyes on
the actuator. Use the actuator housing to
align the valve directly over the tank nozzle.
Do NOT use the pilot valve or pickup line to
pull the valve into position.

2. Aluminum valve bodies should be
connected with flat faced 150# ANSI
flanges. A full faced gasket is
recommended. Mating flanges should be
flat within .020" and clean, free of scratches,
corrosion and tool marks.

3. Each valve is leak tested at the factory as
part of our standard inspection procedures.

4. Inspect the gasket; make sure that the
material is suitable for the service. Gasket
dimensions are listed below, Table 2. Full
gaskets must be used with flat face flanges.

Either full or ring gaskets may be used with
raised face flanges.

Table 2

Body Flange Gasket Dimensions

150# ANSI

Flange*

2” RF 4.12 2.38 --- --- --­3” RF 5.38 3.50 --- --- --­4" RF 6.88 4.50 --- --- --­6” RF 8.75 6.62 --- --- ---

8” RF 11.00 8.62 --- --- --­10” RF 13.38 10.80 --- --- --­12” RF 16.12 12.80 --- --- ---

2" FF 6.00 2.00 4.75 0.75 4

3" FF 7.50 3.00 6.00 0.75 4

4” FF 9.00 4.00 7.50 0.75 8

6” FF 11.00 6.00 9.50 0.88 8

8” FF 13.50 8.00 11.75 0.88 8
10” FF 16.00 10.0 14.25 1.00 12
12” FF 19.00 12.0 17.00 1.00 12

* RF = Raised Face, FF = Flat Face

O.D.

(IN)

I.D.
(IN)

B.C.

(IN)

Hole

(IN)

Qty

5. Lubricate all studs and nuts with an
appropriate thread lubricant. If stainless
steel fasteners are used, use an anti-seize
lubricant such as moly-disulfide (Table 6).

6. Center the gasket within the bolt circle of
the tank nozzle flange.

7. Set the valve carefully on the nozzle.

8. Install nuts and lock-washers and torque all
fasteners to half the recommended value in
a staggered, alternating pattern. Consult

with Plant and/or Maintenance Personnel
for appropriate practices and standards.

Table 3

Recommended Minimum Torque Values*

Size

10” 12 7/ 8” - 9 75 138
12” 12 7/ 8” - 9 93 179

*Note: Torque values are based on a gasket factor m = 3.5,
gasket factor y = 4000 psi, operating pressure = 30 psi

Qty

Holes

2” 4 5/ 8” - 11 31 81
3” 4 5/ 8” - 11 43 106
4” 8 5/ 8” - 11 29 68
6” 8 3/ 4” - 10 51 101
8” 8 3/ 4” - 10 78 142

Bolt

(UNC)

Torque (lb-ft)

Raised Face Flat Face

9. Make sure that the flanges are not distorted
and that the gasket is evenly compressed.

10. Make up the final torque and check that no
further nut rotation occurs.

11. Normally, the pilot sense is integral to the
valve assembly. However, if the optional

4