Hawe Hydraulics Pvt. Ltd. Supplies Screw-in Check Valves with Hydraulic Release. Hawe Hydraulics Pvt. Ltd. Is an ISO 14001:2005 accredited company. The Screw-in Check Valves with Hydraulic Release of type CRH and RHC are used in hydraulic circuits together with design related, leaking directional valves, as a hydraulically actuated drain, or idle circulation valves. The Screw-in Check Valves with Hydraulic Release of type RHC with or without pre-release [for high pressure and high consumer flows] are designed as screw-in valves. The Type CRH valves are designed as a valve cartridge. Many different versions are available to cover all requirements. Both types of Screw-in Check Valves with Hydraulic Release can be screwed In mounting holes which can be easily machined with a standard drill [point angle 118 Degree].