ZHD type multi-layer control valve

ZHD type multi-layer control valve introduction

ZHD type multi-layer control valve applied with multi-cage sleeve type spool or axial labyrinth spool, multi-layer pressure reducing. It controls the medium flowrate, reduces noisy caused by high pressure air or steam, qualified in high pressure medium occasion. It can be applied with multi-spring pneumatic diaphragm actuator or electric actuator.

ZHD type multi-layer control valve Specification

Body type: straight through casting globe type
Spool type: multi-layer choke spool
Nominal size: DN20~200 NPS 3/4〞~ 8〞
Nominal pressure: PN160 ~ 420 CLASS 900LB ~2500LB
Connection: flange: FF、RF、MF、RTJ Welding: SW、BW
Bonnet type: standard type(-5℃~230℃)、
Radiator type: (-45℃~higher than 230℃ occasion)、
Low temperature extended type(-196℃~ -45℃)
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 polyurthane ceramic paint.

Code

ZHD type multi-layer control valve

ZHD type multi-layer control valve


Such as: Z type pneumatic diaphragm multi-layer sleeve type control valve, pressure PN160,valve materialA105,nominal size DN50,type: ZJHD-160 DN50

Performance

ZHD type multi-layer control valve

ZHD type multi-layer control valve


Note 1: specification on the basis of control valve with positioned and PTFE packing.

Special specification

ZHD type multi-layer control valve

ZHD type multi-layer control valve

Actuator

ZHD type multi-layer control valve

ZHD type multi-layer control valve


Note 1: non-standard accessories, need special customized notes.

Design characteristic

◆ Continious regulating within high pressure difference range
◆ Multi-layer gradually pressure reducing, each layer pressure reducing are above the evaporization pressure, anti-cavitation, low noisy.
◆ Spool in non-balanced structure, good conical surface sealing performance.
◆ Sleeve structure with multi-hole cage type, high regulating performance.
◆ Installed guide on the top and bottom of spool, regulating balance, non-vibration and self-cleaning.
◆ Sealing surface welded with hard alloy, spool (stem) surface painted with hard alloy material, high wearing and galling resistance, long life span.

Application

◆ Boiler water feed bypass regulate low load operation occasion.
◆ Water feeding recirculation bypass regulating. (Mini-flow control valve)
◆ High pressure bypass water spray heat reducing, superheater thermoreduction.
◆ Other high pressure difference occasion medium regulating.

ADesign characteristic

◆ Medium flow while pressure reducing via multi-layer throttling disc, anti-cavitation and reducing noisy.
◆ Non-balanced and balanced spool. Balaned type has seal ring on the balanced hole.
◆ Seat in conical seal surface, with stable seal performance while valve closed.
◆ Sealing surface welded with hard alloy, spool (stem) surface painted with hard alloy material, high wearing and galling resistance, long life span.

Application

◆ Cylinder and main regulating valve dewatering.
◆ Cylinder, medium-pressure control valve and air extracting system dewatering.
◆ Boiler superheater thermoreduction.
◆ High pressure bypass and variety thermoreduction system high pressure difference spray.
◆ Water feed recirculation, water feed bypass valve, periodic sewage system, etc.
◆ Other high pressure difference occasion medium regulating.
Note: For detailed structure dimension and trim material, please contact with DATIAN.