OM2-8193-0200
Corrosion-Resistant
Teflon Control Valve
Model : HIT
User's Manual
NOTICE
While the information in this manual is presented in good faith and
believed to be accurate, Azbil Corporation disclaims any implied
warranty of merchantability or fitness for a particular purpose and
makes no express warranty except as may be stated in its written
agreement with and for its customer.
In no event shall Azbil Corporation be liable to anyone for any
indirect, special or consequential damages. This information and
specifications in this document are subject to change without notice.
© 1993–2013 Azbil Corporation All Rights Reserved.
1. GENERAL
This manual comprises a general overview of the structure, operating procedures, and
maintenance of Model HIT Corrosion-Resistant Teflon Control Valves.
1.1Structure
A Corrosion-resistant Teflon Control valve consists of three major sections: valve body,
actuator, and positioner as shown in Figure 1.1.
Acturator
Positioner
Valve body
Figure 1.1.
Basic Structure of Control Valve
–1–
1.1.1 Valve Body
There are two types of valve bodies: regular and bellows, classified by type of plug.
The parts in contact with fluid, such as valve body interior, valve plug, and guides, are
made of highly corrosion-resistant PTFE. The outer frame of valve body, the bonnet, and the
valve stem are made of stainless steel.
1.1.2Actuator
The model HIT valve employs the Model PSK1 actuator, a multi-spring diaphragm motor.
By its diaphragm and springs, it converts a pneumatic signal into a position signal with which to
drive the valve plug via a valve stem.
For manual operation, a manual handwheel can be installed on top of the control valve.
1.1.3 Positioner (optional)
Refer to the relevant operator's manual:
OM2-8310-0400: Single-acting Pneumatic Valve Positioner, Model VPE
OM2-8313-0100: Single-acting Electric/Pneumatic Valve Positioner, Model HEP
CM1-AVP300-2001: Smart Valve Positioner, Model AVP
1.2 Control Valve Specifications
A nameplate as shown in Figure 1.2, is attached to each control valve. The nameplate
indicates the model number, product number, date of manufacture, valve size, parts materials,
and other major specifications. Before using the control valve, be sure its specifications conform
with your intended use. When making any inquires on the control valve, such as for requesting
information on modifications of the valve or ordering replacement parts, please mention the
product number.
Figure 1.2.
Control Valve Nameplate
–2–
2. STRUCTURE
2.1 Structure of Valve Body
2.1.1Regular
The structure of the regular valve body is shown in Figure 2.1.
1
2
3-1
3-2
4
5
12
6
13
2
14
4
15
7
16
8
17
9
18-1
18-2
18-3
10
11
19
20
21
No.
Parts
Material
1
2
3-1
3-2
4
5
6
7
8
9
10
11
Valve stem
O-ring(P10)
Packing compression nut
Lock nut
O-ring(P16)
Spring
Packing ring
V PTFE retainer
V PTFE packing
V PTFE receiver
Retainer
Screw
No.
SUS316
FEPM
SUS316
SUS304
FEPM
SUS316
SUS316
PTFE
PTFE
PTFE
SUS304
SUS316
Figure 2.1.
12
13
14
15
16
17
18-1
18-2
18-3
19
20
21
Parts
Bonnet
Guide holder
Screw(M6x10L)
Valve plug
Valve body
Rubber seat
O-ring
PTFE ring
O-ring
Flow direction indicator
Driving screw
PTFE main body
Structure of the Regular Valve
–3–
Material
SUS304
PTFE
SUSXM7
PTFE
SUS304
FPM
FEPM
PTFE
FEPM
SUS304
SUS304
PTFE
2.1.2 Bellows Type
Structure of the bellows-type valve body is shown in Figure 2.2.
1
3
2-1 2-2
4
5
6
7
8
15
9
16
10
17
11
18-1 18-2 18-3
19
20
12
21
13
14
22-1 22-2 22-3
23
24
No.
Parts
No.
Parts
1
2-1
2-2
3
4
Valve stem
Packing compression nut
Lock nut
O-ring(P10)
O-ring(P16)
SUS316
SUS316
SUS304
FEPM
FEPM
Material
15
16
17
18-1
18-2
5
6
7
8
9
10
V PTFE retainer
V PTFE packing
V PTFE receiver
Spring
Packing ring
Vent plug
PTFE
PTFE
PTFE
SUS316
SUS316
SUS316
18-3
19
20
21
22-1
22-2
11
12
13
14
Vent bushing
Valve body
Retainer
PTFE main body
SUS316
SUS304
SUS304
PTFE
22-3
23
24
Bonnet
Tape liner
Screw(M6x10L)
O-ring
PTFE ring
(For upper guide spacer)
O-ring
Guide spacer
Valve plug
Rubber seat
O-ring
PTFE ring
(For lower guide spacer)
O-ring
Flow direction indicator
Driving screw
Figure 2.2.
Structure of Bellows-type Valve
–4–
Material
SUS304
PTFE(V-7980)
SUSXM7
FEPM
PTFE
FEPM
PTFE
PTFE
FPM
FEPM
PTFE
FEPM
SUS304
SUS304
3
Pneumatic
actuator
No.
2
1
5
4
6
Valve body
parts
1
Stem connector (pointer)
2
Bolt
3
Actuator stem
4
Valve stem
5
Yoke
6
Setscrew (hex socket head)
Figure 6.1. Parts for Removing the Actuator
6.3 Disassembly of Valve Body
6.3.1 Disassembly of Regular Valve Body
For disassembly of the regular valve body, refer to Figure 2.1 and proceed as follows:
(1) Loosen the packing compression nut
-1.
(2)‌Loosen the four hex-socket-head setscrews (M6) around the bonnet by using a
hex bar wrench (nominal size 3 mm). Loosen the bonnet from the valve body by
using a wrench (nominal size 65 mm). Pull up the bonnet to remove it from the valve
stem .
(3)‌Remove the guide holder
.
. Remove the valve stem
together with the valve plug
CAUTION
Never remove the seal retainer, PTFE main body, or rubber seat from the
valve body.
-1, spring , packing ring , V PTFE
(4)‌Remove the packing compression nut
retainer , V PTFE packing and V PTFE receiver from the bonnet and
guide holder .
(5) Remove the gland. O-ring and guide O-ring.
– 10 –
6.3.2 Disassembly of Bellows-type Valve Body
For disassembly of the bellows-type valve body, refer to Figure 2.2 and proceed as follows:
(1) Loosen the packing compression nut
-1.
(2)‌Loosen the four hex-socket-head setscrews (M6) around the bonnet by using a
hex bar wrench (nominal size 3 mm). Loosen the bonnet from the valve body by
using a wrench (nominal size 65 mm). Pull up the bonnet to remove it from the valve
stem .
(3)‌Remove the valve stem
.
together with the valve plug
. Remove the guide spacer
CAUTION
Never remove the seal retainer, PTFE main body, or rubber seat from the
valve body.
(4)‌Remove the packing compression nut -1, spring , packing ring , V PTFE retainer , V PTFE packing and V PTFE receiver from the bonnet .
(5) Remove the gland. O-ring and guide O-ring.
6.4 Disassembly of Actuator
6.4.1 Disassembly of Direct-acting Actuator
For disassembly of the direct-acting actuator, refer to Figure 6.2 and proceed as follows:
(1) Disconnect the air piping and accessories from the actuator.
(2) Remove the stem connector.
(3) Remove the bolts (except the eyebolts) of the diaphragm case.
(4)‌Loosen the nuts of the two eyebolts gradually and evenly. [These two bolts determine
the initial spring compression setting when assembling the actuator.]
(5) Remove the diaphragm case. Remove the rod and diaphragm unit upwards.
(6) Remove the springs.
6.4.2 Disassembly of Reverse-action Actuator
For disassembly of the reverse-acting actuator, refer to Figure 6.3 and proceed as follows:
(1) Disconnect the air piping and accessories from the actuator.
(2) Remove the stem connector.
(3) Remove the bolts (except the eyebolts) of the diaphragm case.
(4)‌Loosen the nuts of the two eyebolts gradually and evenly. [These two bolts determine
the initial setting of spring compression when assembling the actuator.]
(5) Remove the diaphragm case. Take out the springs.
(6) Remove the rod and diaphragm unit upwards.
– 11 –
7. ASSEMBLY OF CONTROL VALVE
CAUTIONS
Before starting assembly, fully inspect all parts. If you find any damaged
parts, replace them with new ones.
Never re-use old gland packing. Be sure to use fresh gland packing
whenever assembling the control valve.
When ordering parts, please also mention the product number of the
control valve, which is indicated on the nameplate.
7.1 Assembly of Valve Body
For assembly of the valve body, as a general rule, follow the disassembly procedures in
the reverse order.
Thoroughly clean all parts before starting assembly. Be sure they do not carry dust, dirt or
other foreign matter.
All sealing parts and mating surfaces should be covered with grease or another appropriate sealing lubricant that will not be attacked by the process fluid. When control valves are
shipped from the factory, silicone grease is applied as sealing lubricant (except for oil-free control valves.)
7.1.1 Assembly of Regular Valve Body
For assembly of the regular-type valve body, refer to Figure 2.1 and proceed as follows:
(1) Set the O-ring
-1, 3 and PTFE ring
-2 in the valve body
.
with valve stem
in the guide holder
, and set them in the
(2)‌Set the valve plug
valve body .
(3)‌Setting so that the valve stem
passes through the center of the bonnet , couple
the bonnet to the valve body using the threads. Turn the bonnet with the specified
torque until the threading shoulder of the bonnet is brought into contact with the top
plane of the valve body cylinder. For the tightening torque of the bonnet, see Table
7.1.
(4)‌Apply Loctite to the four M6 hex-socket-head screws and drive them into the bonnet so that the bonnet is securely fixed and does not become loose. (When the valves
are shipped from the factory, Loctite #602 is applied as the locking agent.) For the
tightening torque of the setscrews, see Table 7.1.
(5) Set the gland parts
,
,
,
,
,
and
in this order.
(6)‌Tighten the packing compression nut
-1 until it is brought into contact with the
bonnet . For the tightening torque of the nut, see Table 7.1.
7.1.2 Assembly of Bellows-type Valve Body
For assembly of the bellows-type valve body, refer to Figure 2.2 and proceed as follows:
(1) Set the O-ring
-1, 3 and PTFE ring
(2) Set the guide spacer
in the valve body
– 13 –
-2 in the valve body
.
.
(3)‌Set the O-ring -1, 3 and PTFE ring -2 in the guide spacer . Set the valve plug
with valve stem into a position that the brim section of the valve plug is aligned
with the centering location of the guide spacer .
(4)‌Apply the tape liner
for the valve stem.)
on the bore of the bonnet
. (The tape liner acts as a guide
passes through the center of the bonnet , couple
(5)‌Setting so that the valve stem
the bonnet to the valve body by means of the threads. Turn the bonnet with the specified torque until the threading shoulder of the bonnet is brought into contact with
the top plane of the valve body cylinder. For the tightening torque of the bonnet, see
Table 7.1.
(6)‌Apply Loctite to the four M6 hex-socket-head screws and drive them into the bonnet so that the bonnet is securely fixed and does not become loose. (When the valves
are shipped from the factory, Loctite #602 is applied as the locking agent.) For the
tightening torque of the setscrews, see Table 7.1.
(7)‌Set the gland parts
,
,
,
,
,
and
in this order.
(8)‌Tighten the packing compression nut
-1 until it is brought into contact with the
bonnet . For the tightening torque of the nut, see Table 7.1.
Table 7.1.
Valve Size
Bonnet
3/4" & 1"
250 ± 37
{2500 ± 375}
[M68 × 1.5]
1-1/2"
300 ± 45
{3000 ± 450}
[M90 × 2]
2"
350 ± 51
{3500 ± 525}
[M100 × 1.5]
Tightening Torques (N·m {kgf·cm})
Hex-socket-head Setscrews
Packing Compression Nut
8 ± 1.2
{80 ± 12}
[M6 screw]
80 ± 12
{800 ± 120}
[M26 × 1.5]
7.2 Assembly of Actuator
Before starting assembly, be sure the parts are perfect without any flaws, deformation,
peeling of paint, or other defects, To assemble the actuator, proceed as follows:
7.2.1 Assembly of Direct-acting Actuator
To assembly the direct-acting actuator, proceed as follows:
(l)‌Set the bearing (together with the dust seal) to the yoke. Fix the bottom diaphragm
case to the yoke with the four M10 bolts.
(2)‌Fix the spring plate (sec Figure 7.1) and set the springs on the spring plate.
(3)‌Insert in to the bearing the rod to which the diaphragm has been set. When doing this,
be careful not to damage the bearing and dust seal with the threaded section of the
rod. (For example, cover the threaded section with adhesive vinyl tape.)
– 14 –
235
ø218
(28)
H
A
Figure 7.4. Overall Dimensions
Table 7.3.
Overall Dimensions and Weights
Valve size (inch)
3/4
1
1 1/2
2
A (mm)
140
140
200
240
PSK1D
425
425
455
455
PSK1R
445
445
475
475
15
15
18
23
H (mm)
Weight (kg)
– 19 –
8. ‌DIRECT/REVERSE-ACTING CONVERSION AND SPRING RANGE
MODIFICATION
8.1 Conversion To Direct- or Reverse-acting Type
When you want to convert your control valve into a reverse-action type or a direct-action
type, it is recommended to change the whole actuators. However, if you want to convert your
actuator by replacing required parts only, you need the parts shown in Table 8.1 or 8.2. In these
tables, “+” denotes the new parts which you need to acquire for the conversion and “-” denotes
the parts which you don't need for the conversion and which will become surplus parts.
Table 8.1.‌Parts for Direct to Reverse
Conversion
Table 8.2.‌Parts for Reverse to Direct
Conversion
PSK1D → PSK1R
PSK1R → PSK1D
Parts
Q'ty
Parts No.
Parts
Q'ty
Parts No.
Seal washers
+4
82521069-101
Seal washers
-4
82521069-101
Rod packing
+1
82521067-102
Rod packing
-1
82521067-102
Rain cap
+1
82553334-101
Rain cap
-1
82553334-101
For the conversion procedure, refer to Chapter 6 “DISASSEMBLY OF CONTROL VALVE”
and Chapter 7 “ASSEMBLY OF CONTROL VALVE.”
8.2 Spring Range Modification
To change spring ranges of Model PSK1 Actuator, refer to Table 8.3 which indicates the
color coding, dimensions and the required quantities of actuator springs.
Table 8.3.‌Actuator Springs
Spring range
kPa {kgf/cm2}
Color coding
Free length of springs
mm
Q'ty
80 - 240
{0.8 - 2.4}
Yellow
89
4
120 - 290
{1.2 - 3.0}
Orange
73
4
– 20 –
10. OVERALL DIMENSIONS AND WEIGHTS
(1) Main Unit of Model PSK1
235
ø218
240
M9 × 1
ø34.9
Stroke: 20 mm
Effective diaphragm area: 160 cm2
Maximum capacity of
diaphragm chamber: 700 cm2
Weight: 8 kg
Table 10.1. Overall Dimensions (Main Unit)
(2) Actuator with Top Handwheel
Stroke
mm
20
Overall dimensions mm
øB
B
øD
H
Maximum handwheel
operating force
N {kgf}
218
235
140
390
160 {16}
Weight
(kg)
9.5
Table 10.2. Overall Dimensions (Actuator with Handwheel)
– 24 –
Document Number:OM2-8193-0200
Document Name:
Corrosion-Resistant Teflon Control Valve
Model : HIT User's Manual
Date: Issued/Edited by:
1st edition: Nov. 1993
2nd edition: Dec. 2013
Azbil Corporation