Control Valve

ZHP Type Single Seat Control Valve

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Electric Single Seat Control Valve Pneumatic Single Seat Control Valve Electric Single Seat Control Valve Electric Single Seat Control Valve

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Category : Control Valve. Tags : control valve, Linear actuator control valve

ZZHP type electric pneumatic single seat control valve is a kind of top pilot single seat valve, which has simple structure, well sealing, high flow rate and stable application performance. Reasonable top spiral system can avoid vibration during small opening percentage, so as to extend valve working life.

Single Seat Control Valve Specification

Body type: straight through casting globe type
Spool type: non-balanced single seat plug type
Nominal size: DN20~200 NPS 3/4〞~ 8〞
Nominal pressure: PN16 ~ 100 CLASS 150LB ~ 600LB
Connection: flange: FF、RF、MF、RTJ
Welding: SW、BW
Flange dimension: acc. to IEC 60534
Bonnet type: standard type(-5℃~230℃)
Radiator type: (-45℃~ high than 230℃ occasion)
Low temperature extended type(-196℃~ -45℃)
Bellow seal type
Warm insulation Jacket type
Packing: V type PFTE packing, flex. graphite packing, etc.
Gasket: Metal graphite packing
Actuator: pneumatic: multi-spring diaphragm actuator, piston type actuator.
electric: 3810L series smart actuator, PSL series actuator.
Surface painting: Green color, acrylic acid polyurthene ceramic paint.

Single Seat Control Valve Code

Z Actuator H Structure Nominal pressure Body material Nominal size
Z series control valve J:  pneumatic diaphragm actuator
H: pneumatic piston actuator
R: electric 3810L actuator
D: electric PSL actuator
Hdirect travel P:  standard single seat
PF: soft sealing single seat
PL: single seat cage type
PG: radiator single seat type
PV: bellow seal single seat
PD: low temperature single seat
PN16=16
CL150LB=150 LB
JIS10K=10K
C=WCB
LC=LCB
P=CF8
PL=CF3
R=CF8M
RL=CF3M
D=special material
DN25= DN25
NPS1〞=NPS1〞
Such as:  Z type pneumatic diaphragm single seat control valve, PN16, body:  WCB, nominal size:  DN50, type:  ZJHP-16C DN50

Single Seat Control Valve Performance

Flow characteristic Linear, percentage, quick open
Allowable range 50: 1 (CV<6.3 30: 1)
Rated Cv value Percentage CV1.6~630 ,linear CV1.8~690
Allowable leakage Metal seal:  IV grade(0.01% rated capacity)
Soft seal:  VI grade(foam grade) Leakage standard:  GB/T 4213
Performance   Pneumatic Electric
Intrinsic error % ±1.5 ±1.0
Return difference, % ≤1.5 ≤1.0
Dead zone, % ≤0.6 ≤1.0
Difference from beginning to end point, % ±2.5 ±2.5
Rated travel difference, % ≤2.5 ≤2.5
Note: specification on the basis of control valve with positionerand PTFE packing.

Single Seat Control Valve Special specification

Special test Material penetration flaw detection (PT), radiator test (RT), flow characteristic test,
low temperature test.
Special treatment Trim nitrogen treatment, seat hard alloy treatment.
Special rinse Degreasing and dehydration treatment
Special condition Special piping or connection, vacuum condition, S.S fastener, special coating.
Special dimension Customized face to face length or dimension
Test and inspection Third party test report

Single Seat Control Valve Actuator

Type\ Method Pneumatic diaphragm actuator Electric actuator
ZH23~ZH56 3810L series
Multi-spring type Intelligent integrated type
Usage Regulating type, ON-OFF type Regulating
Air supply pressure or Power supply voltage Air supply pressure (Spring range)
140(20~100)Kpa G
240 (40~200) Kpa G
280 (80~240) Kpa G
Power: AC 200V±10%  50Hz
Or Power:  AC 380V±10% 50Hz
Connector Air pipe connector: RC1/4 Nomal type:  cable inlet 2-PF(G1/2〞)
Explosive proof:  Protection jacket PF(G3/4〞)
Direct action Pressure increase, stem descend, valve close. Input signal increase, stem descend, valve close.
Reaction Pressure increase, stem ascend, valve open. Input signal increase, stem ascend, valve open.
Input signal 40~20mA.DC(with positioner) Input/output4~20mA.DC
Lag ≤1%FS(with positioner) ≤0.8%FS
Linear type 2%FS(with positioner) +1%FS
Environmental temperature -10℃~+70℃ Standard type: -10℃~+60℃
With space heater : -35℃~+60℃
Explosive proof: -10℃~+40℃
Surface coating Green, acrylic acid polyurethane coating Blue, acrylic acid polyurethane coating
Accessories E/P, P/P valve positioner, filter regulator, valve converter, solenoid valve, limited switch Space hearter (normal type)
Note 1: non-standard accessories, need special customized notes.

Single Seat Control Valve Parameter

Seat diameter(mm) 10 12 15 20 25 32 40 50 65 80 100 125 150 200
Rated Cv Percentage 1.6 2.5 4.0 6.3 10 16 25 40 63 100 160 250 400 630
Linear 1.8 2.8 4.4 6.9 11 17.6 27.5 44 69 110 176 275 440 690
Nom. size Travel Option flow characteristic Cv. (★standard  ●recommanded  ○customized)
DN20 16mm                    
DN25                  
DN32 25 mm                
DN40                
DN50                
DN65 40mm                    
DN80                  
DN100                
DN125 60mm                    
DN150                    
DN200                  
Pneumatic actuator
Diaphragm area, Ae(cm2)
ZHA/B-22 ZHA/B-23 ZHA/B-34 ZHA/B-45
350 350 560 900
Action Spring range Metal sealing allowable pressure difference (MPa)
Air open 20-100KPa 4.46 3.09 1.98 1.16 0.7 0.44 0.28 0.18 0.17 0.11 0.07 0.07 0.05 0.03
40-200 KPa 6.4 6.4 5.94 3.34 2.14 1.31 0.84 0.53 0.51 0.33 0.21 0.22 0.15 0.09
80-240 KPa 6.4 6.4 6.4 6.4 4.99 3.05 1.95 1.25 1.18 0.78 0.5 0.51 0.36 0.21
Air close 20-100KPa 6.4 6.19 3.96 2.23 2.14 0.87 0.56 0.35 0.34 0.22 0.14 0.15 0.1 0.06
40-200 KPa 6.4 6.4 6.4 6.4 6.4 5.86 3.64 2.3 2.21 1.43 0.91 0.95 0.66 0.37
80-240 KPa 6.4 6.4 6.4 6.4 6.4 6.4 5.04 3.18 3.06 1.98 1.26 1.32 0.92 0.52
Electric actuator Metal sealing max. allowable pressure difference (MPa)
Type Thrust(N)
3810L-08 800 6.4 5.5 3.5 2.38                    
3810L-20 2000 6.4 6.4 6.4 4.77 3.05 1.86 1.19 0.76            
3810L-30 3000           2.79 1.79 1.14            
3810L-50 5000           4.66 2.98 1.91 1.13 0.6 0.47      
3810L-65 6500                 1.35 0.8 0.57 0.39 0.26 0.16
3810L-99 10000                       0.61 0.42 0.20
3810L-160 16000                       0.97 0.67 0.35

Standard material and internal structure

Table 1: Body WCB
1 Body WCB LCB WC9
2 Seat 304 304 304
3 Spool 304 304 304
4 Gasket 316+graphite/PTFE
5 Bushing 304 304 304
6 Bonnet WCB LCB WC9
7 Packing PTFE/flex. graphite
8 Packing bushing 304 304 304
9 Gland WCB WCB WCB
10 Stem 304 304 304
12 Stud 45 40MnB 25Cr2Mo1VA
13 Nut 35 35 25Cr2Mo1VA
self-operated control valve Dimension and weight Table 2: Body S.S
1 Body CF8 CF8M CF3M
2 Seat 304 316 316L
3 Spool 304 316 316L
4 Gasket 316+graphite/PTFE
5 Bushing 304 316 316L
6 Bonnet CF8 CF8M CF3M
7 Packing PTFE/flex. graphite
8 Packing bushing 304 316 316L
9 Gland CF8 CF8M CF3M
10 Stem 304 316 316L
12 Stud 304 316 316L
13 Nut 304 316 316L
Note:
  • Above structure, seat is metal sealing, PTFE soft sealing is VI grade as option, also can provide stellite hard seal. As per actual working temperature, we may choose proper bolt & nut accordingly.
  • PTFE V type stem packing is with graphite, the working temperature can be higher than 232℃(450 F)
  • The common body material is WCB and S.S, can apply with other high corrosion resistance alloy material.

Single Seat Control Valve Variety valve structure

PV bellow sealed single seat control valve
PV bellow sealed single seat control valve
Can apply with multi-layer bellow seal, well protect medium against loss.
PD low temperature single seat control valve
PD low temperature single seat control valve
spool integrated external suction structure, convenient and easy for maintenance.
PG radiator single seat control valve
PG radiator single seat control valve
applicable for temperature -45℃~higher 230℃.
PF soft sealing single seat control valve
PF soft sealing single seat control valve
applicable for VI grade sealing requirement.
PL single seat cage type control valve
PL single seat cage type control valve
symmetry multi-pore cage structure can control noisy and cavitation effectively.