Hydraulic control valve is a general title of a series control valves, which was earlier made in Israel, Holland, Demark, US, Canada etc. countries and led into China in 1900s. The hydraulic control valve series made in this Co.cover remote control floating valve, adjustable pressure reducing valve, slowly closed checkvalve, pressure discharge/sustaining valve, electric valve, water pump control valve, pressure differential balancing valve, emergent close valve, raining valve,water level fixing valve etc. products and are used for the pipe network of building, fire-fighting, water works, warming, steel & iron, electric power, petroleum,chemical industry etc. systems.

This valve makes a series valve formed by such a way as utilizing the hydraulic control principle and the pressure differential between both upper andlower valve cavities to control the disc's movement and acting as different functions via the by-pass pipelines and the pilot valves of various different struc-tures.

In 2001, the hydraulic control valve products made in this Co. were entitled as the most advanced products nationwide approved by both Scientific Commission and Construction Commission of Shanghai. The appraisal number: 2001-6133.
In 2002, this Co. was entrusted by the office of Shanghai Engineering Construction Standardization to draw out SJ series hydraulic control valve installa-tion figure collection of the recommended application figure collection of Shanghai buildings' products, the figure collection number: 2002 HU S/T-104.
In 2002, this Co. is entrusted by the Association of China Engineering Construction Standardization to draw out the standard for the application and de-sign rules of hydraulic control valves. The standard number: CECS144: 2002.
In 2004, this Co. is entrusted by the office of China Engineering Construction Standardization to draw out the industrial standard for the hydraulic controlvalve products(coming soon).
PRODUCT FEATURES

The body is full-channel and streamline designed, leaving small fluid resistance and a big flow;
Both outside and inside of body and bonnet are coated with epoxy resin powder and protect them out of corrosion;
Use the advanced foreign know-how of removable seat ring, exquisite structure, easy repair and replacement (no need to remove the whole valve);
Vertically or horizontally mountable in the pipeline with the reliability kept unchanged;
A dual protection of sealing pad and sealing ring is used on the connections between body, bonnet and piston cylinder;
For the piston cylinder, a flow-guide hole is set and appropriate damp is addad with it so as to have the piston movement more stable and flexible;
The complete combination of full stainless steel piston cylinder, overall piston and NBR seal ring gets the duration greatly extended.
Materials of Main Parts

Type	Diaphragm type		Piton type
	Part	Materials	Part	Materials
1	Bonnet	Casting pig,Ductalloy,carbon steel,SS	Bonnet	Casting pig,Ductalloy,carbon steel,SS
2	spring	Spring steel SS	Cylinder sleeve	SS
3	Pressboard of diaphragm	Casting pig,Ductalloy,carbon steel,SS	Piston	Ductalloy
4	Diaphragm	Acrylonitrlle nyon reinforced rubber,ternary ethylenepropylene nylon reinforced rubber	seal ring	NBR.Ternary etyleneproplene
5	stem	2cr13cr13.ss	Steam	2cr13cr.ss
6	Disc	Casting pig.Ductalloy,carbon steel,copper.SS	spring	Spring steel,SS
7	O-ring	NBR,ternary ethylenepropylene rubber	Disc	Casting pig.Ductalloy,carbon steel,SS
8	Pressboard of O-ring	Casting pig,Ductalloy,carbon steel,SS	Sealing pad	NBR.Ternary etyleneproplene
9	Seat ring	Cu-alloy .SS	Seal ring	Cu-alloy.SS
10	Body	Casting pig.Ductalloy,carbon steel SS	Seal pressboard	Casting pig,Ductalloy,carbon steel,SS
11			Body	Cast iron,Ductalloy,carbon steel body